I have a Savannah also, 50@28. I'm shooting 35/55's at 29.5 and theu fly great. My nocking point is 1/8 high from center. At 55#, you might need 55/75's. Is the kick up and down or side to side? Up and down is usually nocking point too high or too low. Shortening the arrow will make it stiffer. I shot a bare shaft at 31 inches, then cut off a 1/4 inch at a time till the shaft was hitting straight at 10 yards. I stopped at 29.5. I also set the brace height at 7 1/4 and get good groups.
By the way, the spine for a recurve is different than for a longbow
Good luck