Nice job Burn. I agree to stick with the 60's if you like them. There are lots of bullets that will all work great. No matter which bullet you run, you will likely get an occasional runner.
I ran 50 gr vmax's for a few years from a 22" bolt .223 near max load. Shot about 60 coyotes with them. Most dropped in their tracks. Probablly 5-10 of those 60 got up and ran anywhere from 10' and dropped, to 1+ miles and no recovery. Most runners were shot in the front shoulder. I think the bullets just didn't penetrate enough.
This spring I picked up a box of Sierra Gameking 55gr HPBT .224 bullets to try. Still running near max load in my .223. Haven't had a runner yet, though several flop around on the ground for a few seconds before expiring. This is a much more stout bullet. I shot one broadside, the bullet went through the coyote, exited, and then lodged in an alder tree behind it. It looked like the tree had been shot with a .22lr. There was no observable expansion. I have shot a couple coyotes in the front shoulders, as they were standing quartering toward me. These bullets seem to punch through the shoulder bones and get to the vitals, which is what I wanted. These bullets have a pretty wide hollow point and poor ballistic coefficient. For the 50-100 yds shots i've taken with them, i'm very happy with them so far. If I go hunting over fields where i expect to possibly take shots over 200 yds, i'll probably grab a box of 50 gr Vmax's for the higher BC.