That was going to be my suggestion. Just be aware that they will measure around 40mm on a modern wide rim. If you have the clearance for them, that is what I would choose.

I'm looking for something similar for a race with 7 mile laps, with a 3/4 mile gravel section. I want tire volume to stay attached on the rough, pot-holed gravel, with minimal rolling resistance for the pavement. I decided the compass offerings were too expensive, and the panaracers are too slow on pavement.

I'm running the Panaracer GK slicks in 38c. I only have a couple 100 km's on them but have ridden them in a variety of situations and they have performed great on everything except the muddiest and slickest conditions. No problem on gravel/sandy/gritty stuff but if you hit really wet slimy grass or similar you lose traction. I have found them to roll reasonably fast on everything and are a great all rounder.

I would ride my road bike with my 25c (measure close to 28mm) tubeless IRC Roadlites.

Tubeless: 28c Schwalbe Pro One
Tubed: Challenge Paris Roubaix or Specialized Turbo Cotton 26c or 28c

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Well that is two recommendations along the same lines so let me clarify. The gravel section is chunkier than ideal for a 28mm tire. It is definitely survivable on a road bike, but with a bigger tire there is real potential to create a separation and drop everyone who has opted for a smaller tire.

I guess what I'm looking for is the right 32mm slick (tubeless), sorry for high jacking your thread!

I think Schwalbe is making the best tubeless road tires right now. G-One speed and All Around are both available in 38c.

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The above poster has eschewed traditional employment and is currently undertaking the ill-conceived task of launching his own hardgoods company. Statements are not made on behalf of nor reflective of anything in any manner... unless they're good, then they count.
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TomA measured the Challenge Strada Bianca Pro 36 mm with latex tubes as only 2 watts slower than GP4000 23 mm on rollers.

I'm not sure I'd trust them tubeless though. The new Bianca TLR is an option... but does it roll well?

This doesn't help you but I really wish Continental would make their Speed King tire in a tubeless version and in narrower widths.

Yeah. Too knobby!

I'm increasingly convinced I don't need knobs for gravel riding unless it's muddy.

I'm a fan of Maxxis tires.....I run the Ramblers (40's) - not sure if this is too much tread for what you are looking for? Available in 38's
https://www.maxxis.com/...tire-512-139-rambler

Other option which I have not used is their Velocita AR which is a file tread - oply make in 40"s.
https://www.maxxis.com/...-576-139-velocita-ar

The wheels currently have Ramblers. I want a tire that's faster on pavement though for a race with a higher mix of pavement.
The Ramblers are fast for knobby tires though!

I've run those tires on my F-Si (not the one pictured) and honestly I think they have the perfect tread profile for gravel. Their directional nature seems to have no impact on rolling resistance on the road but it aids in braking in slightly loose conditions off road. The knobs don't seem to interact with the road either but when you lean the bike over in a turn off road they do provide a bit of bite (at the expense of providing a bit less traction on road). I don't have anything empirical to back up my statements here it's just my intuition.

What about Challenge Gravel Grinders?
http://www.challengetech.it/...l-grinder-tlr-096/en
These come in 33's or 38's and are now tubeless. There is a thread here on ST about these tires if you want to do some more reading. File tread, light and good on the road. I used these prior to when they had the tubeless version and loved them. Switched to the ramblers to go tubeless.

My go-to tire is the Donnely (formerly Clement) Strada USH 32mm. This rolls very well on pavement and can handle dirt, potholes, and hardpack no problem:
https://www.donnellycycling.com/...olding-bead-clincher
I would go wider if you truly have a lot of loose gravel. I've found 32mm tires can get you through a lot ...as can 28s or 25s, but the lower pressure you can run with 32s makes them worthwhile comfort wise.

I rode the Panaracer GravelKing 38c last Fall. I really like them, although they are somewhat slower than the 32s in most conditions. I agree that it's a great tire if you need the width for flotation. Bonus is the brown sidewall. I found these to be more of a pain to set up tubeless than the Clements, but then I don't have a compressor.

Either can be found for about half the price of the Compass.

Why not just Bianca TLR's? No knobs please.

Have you researched here:?
http://ridinggravel.com/...?p=%3Fforum%3D494958

Horror stories? Can you elaborate? They do take a bit of time to set up properly, but I've had success with them and orange seal. Sure they take more time and it's a bit a process since they lack the sidewall lining... but they are great riding tires. Now about the cost, no argument.

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Suffer Well.

Is there current model crr data on either of those G-Ones?

Trying to tally the delta between them on Pro One.

ETA: just saw the GP5000 TL data. Zoikes.... think i'll pick up 2 of those in 32.

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Specialized Roubaix Pro 2Bliss. They call them "30/32", but mine measure 33.5mm on 18mm (internal) width rims. Easy setup and super dependable tubeless performance on even the roughest terrain. Decent rolling resistance, I use mine occasionally on fast road group rides and I'm fine.