51# @28" Bob Lee Ultimate.   Drawing 28 3/4". Want 29.5" Douglas Fir arrows with 125-135gr points. What spine?

My 52# @ 27" Fedora likes Surewood Steve's Doug fir spined 55/60#. Arrows are cut 28.5"..."Lefty" also shoots 60/65# Fir arrows well. I shoot 125/135/160 grain broadheads on all my arrows with great arrow flight.

70-75

How about a call to the guys at RMS?  I have found Tommy to be a great guy.

I'd go with 65-70# spine.