I'd hunt anything on North America with a 55 pound longbow... except the big bears or maybe moose. A 55 pound compound puts out considerably more power than a 55 pound longbow. If you're comfy at 55 pounds, then you can safely leave well enough alone and go hunting.

If you just WANT to work up to 60 pounds, then that's a different matter. Shoot 3-4 times a week and crank the limb bolts one turn every week or two. As long as your arrows don't get out of spine, you'll probably never notice the increase.