Wing Span (actually measured) 183mm
100M Free Stroke Rate = 1.69 strokes per second*
100M Free (Long Course) time = 1:03.50
1650y Free Stroke Rate ~ 1.00-1.10 strokes per second**
1650y Free time = 21:17

*Actual stroke rate per video analysis. Using you method (total strokes/time) I get 1.49 because that method ignores time not stroking on starts/turns. I could swim essentially the same race SMC and would come up with an even lower rate.

**Estimated based on actual splits & stroke counts, but estimates of time not stroking during turns.

I'm 5'6" and I swim fast. (no idea but I have a sort of 'waterbug' stroke - lower than optimal rotation, high stroke rate)

This will be all over the shop due to push off the wall and the fact that I couldn't give a rats arrse about turnover rate apart from getting most power down over a 100m. So being lazy I will give you strokes per length of a 50m pool and you can work out the turnover.
This is slow because I don't really swim much anymore and I am old and lazy enough to get beat by 14 year olds.
I couldn't do those times today, but could last year when I swam last, but still should be useful for your project.

Wingspan 207cm
1500m 36 strokes per lap 1:08 per 100
100m 37 strokes 58s My sprint sucks balls.

!500 is less strokes mainly because I glide into the wall to save energy.
So no real difference in stroke length but rate is slightly higher due to speed.
Glide is shorter and catch quicker and messy as I see bubbles on my left hand during 100m, but extra speed sees similar stroke length even though glide/catch time is shorter.

Sometimes in 1500 I will double breathe, as in breathe both sides of the stroke every now and again.

Wingspan 207cm
1500m 36 strokes per lap 1:08 per 100
100m 37 strokes 58s My sprint sucks balls.
.

So between your 1500m and 100m you basically keep the same stroke length but your stroke rate goes up by 17 percent. Do you think this is coming by harder pull or a combo of harder pull and harder kick. You 'barely slip' going to the higher speed, or you 'finish' just as far at the end even at the higher stroke rate.

Pull harder, the kick does whatever it needs to balance it.
If I swim 50m, then yes I consciously kick harder, my roll is a little less and there is no glide, the catch happens as quickly as possible if somewhat messy.
50m also creates a quite noticeable wake that I can kick in and the body feels to tip forward and roll downhill.
Kicking is used as a mind trick to key the high turnover, but once out to 100m then I simply do not have the speed/stamina to swim like that, the wake is not big enough to milk energy out of and I basically use the long distance stroke with less glide.

When training I will often put on some flippers to do long distance at race speed and kick just enough to keep the pace at race pace so I can train limb speed for fast swimming but at less exertion and far more time on task that is also race speed specific.
I see no value in slogging out KM's at a slower hand speed as that just trains you to swim slow.
So when not doing intervals and doing a long swim, I like the flippers to keep the muscle speed the same even if just cruising.

Which is one reason why I think pull buoys are plain waste of space for full stroke swimming.
There is nothing that it does that is specific to proper swimming.
It inhibits roll, kicking, makes stupid body position and robs you of the natural feel for body position.

Is there not something to be said for pull-buoys in relation to building arm strength? Or would you use paddles for that?

I find a pull-buoy helps me focus on my catch & pull, as I'm trying to transform into a high-elbow/early catch pull.

Sprinting is the best way to build strength, not that we swim with arms, it's the torso that has the power.
It builds strength and speed. Try doing a bunch of long rest 15m flat out.
Pull buoys are for triathletes who think they will never get better and that having a awkward lump of foam between your legs lifting your bum will magically cure you of a crossover kick.

If triathletes spent as much time sculling as they do playing with toys we would only have swimmers and not swimmers and triathletes.

Ok thanks I'll take you up on your advice. Wiggle do 30-day returns right?!

I'm a sprinter by nature and hate anything above a 100m in practice. Give me 20 x 100m over 4 x 400m any day.

Long-rest 15m sounds like my ideal swim set. What does that look like? I'm in a 50m pool...

I understand the relationship between sprinting and strength, but you don't see Lionel Sanders out on the Velodrome? Should I spend a considerable amount of my sets at race pace (+15% say?) then the rest focusing on breathing/roll/efficiency (sans pull buoy)?