The shorter the brace height the longer the arrow stays on the string thus allowing more time for mistakes. Whatever brand bow you go with , shoot it first to see if you like it. I happen to shoot a Mathews LX at 66lbs and am generating 275fps with 29.5 in. draw and an arrow weight of 423 grains. You should meet your specs with this bow at 27 in and a lighter arrow, set at 70 lbs. Both the Legacy and the LX have the string dampening system which makes the bow shoot like a longer brace height bow. As far as axle to axle, the parallel limb designs of all the newer bows, make the bows shoot smoother, like the longer axle to axle bows that were produced a few years ago. Just remember that speed isn't everyting. You also might be able to get your speeds up by lightening up what is on your string. All I have is a peep and a string loop with tied on nock points. The string loop is served to the string to align my peep. Everyting you add will slow you down. Good luck in your search.