As Tessar said - cutting a post is not unusual. I end up cutting it on nearly every Cervelo I sell, it's just part of the set up.
And I frequently have to cut seatposts during fits as stores just make the rider stretch instead of doing the job properly.

I designed the subsonic bar specifically to help people in your situation (it's not intended to be a bar for everyone). To allow you to get low, with a clean setup and still have adjustment room. You would start with a spacer or two under the bars (not the stem) which will mean you can easily try going lower in future (only low stack clipon that really works with spacers).

If you wanted a wider range of aerobar options we'd be looking at an MTB dropped stem. I'm trying to keep you using fairly standard components.

From the sound of it - 145 cranks might be worth trying - would open hips and raise stack so you're not pushing boundaries as much.

So far based on all of your much appreciated input. I'm leaning towards picking up a Felt IA 16, the TriRig X (hopefully with the gamma one extenders), and eTap to start to build my perfect ride. I'm not sold on staying on my Cervelo (despite the cost of buying new race wheels) and it appears felt has correct for the aero issue of 700 wheels on the 48 from what I can read. Bummed I gotta go all without trying an of this before buying!

The geometry of the IA is very well sorted, you can't do any better with 700 wheels.
The last time I test rode a bike before buying was 1995... (there have been 40 something of them since then). Test riding a bike that isn't set up perfectly is pointless.

A tririg Alpha X will require undermount to hit your numbers. An Alpha one can do it without undermount

Alpha X can do it with slammed adapter as well

Any particular reason why you want eTap?

With the upcoming season approaching quickly and training ramping up, what is driving my decision making is knowing my fit sucks right now and things need to change. I started this search months ago. I'm incredibly uncomfortable and the only appropriate training I can do is in the upright position.

I'm also 5'3" and have been told I have long femurs for my height. I used to ride a 48 cm P2C but had the opposite problem - too stretched out, as all my height is in my legs (I'm short-waisted). And for what it's worth, despite also having race wheels, I was still happy to get rid of the 650's. (Good riddance!)

I am pretty sure that Zipp has never made their 808 wheels in the 650 size.

Hey, I have a possibly dumb question based on your photos. Do you have rather long shins for your height? I'm just playing along voyeur-style with the fix my fit posts, but your shins look long to me.

I'm also 5'3" and have been told I have long femurs for my height. I used to ride a 48 cm P2C but had the opposite problem - too stretched out, as all my height is in my legs (I'm short-waisted). And for what it's worth, despite also having race wheels, I was still happy to get rid of the 650's. (Good riddance!)

True, but that adds other complications (and expense).

Yikes! Seems like that should get fixed first, before looking at new bikes. Especially because you might change your mind on fitting.

What's the complication specifically? The Alpha One is $250 more than the X, so adding the slammed adapter makes the cost a draw. Though $250 seems a high price to pay when the included undermount clamps will do the job.

That's the point of this thread and the new fit she just had done. Now sh'e looking for a bike that will accomodate the new fit.

Complications from a fit/adjustment perspective. I don't like bars where stack changes alter the pad-grip relationship. Also it doesn't tilt. The 10deg spacer is a useful bodge but still limited.