The Cape Hole angle carry is naturally superior in letting each golfer pick their line. This is a good question and I would love to hear other answers, but here is mine (for the moment)
I know a few Tour Pro players who say they only get 8 yards roll on their 290 drives. For most good ams to get near 300 yards, they need the tuned drivers, low spin balls, etc. and they get more like 20-30 yards roll. You would probably want a little cushion since only pros know their carry distance to the yard anyway. And, most ams don't hit it as far as they think, as per Frank Thomas, so they may only really be hitting their advertised 300 yard drives as little as 280 with as much as 30 yards roll meaning the 250-255 carry might still be pretty good.
But, 13 at Colbert Hills, which just 9 years ago I designed for a 255 pure carry, downwind, downhill, is too short for college players now, but it probably plays about 20 yards shorter than its actual distance. It still challenges me!
On my next design for an all or nothing carry option, I think I would use about 265-275 from the back tees. Obviously that moves around depending on wind, elevation, etc. (My "formula" for +/- is a yard for every yard up/downhill and I add a yard for every MPH of helping average wind speed and subtract 2 yards for average MPH wind against - hey, its as good a guess as any as to what the wind might be.)
Of course, if there is a natural starting point for the fw, I don't care exactly what the yardage is. Obviously, the further you bring it forward the more players you challenge, since not all back tee players bomb it 290-300. Maybe you shorten it a bit, but add a side bunker for the longest hitters.
I would also shorten it if necessary to make it work correctly for any middle tees if I couldn't place them proportionally. Oh wait, those have been banned officially at gca.com! Its much more fun I hear for the other 97% of golfers to NOT have those kind of options off the tee in favor of playing back with the big boys and reaching the green in one over regulation!