Dick,
" Look at the FITA bows. The most stable bows utilize a straight riser."
Actually, they have deflexed risers. Hoyt, PSE, Martin, Sky, Win Win, etc... All deflexed risers. I spent several months looking them over before I bought my Hoyt Avalon last year. I didn' t see any FITA bows with straight risers, with the exception of entry-level cheap bows.
Even the elite of the 60' s target bows, like several by the Wilson Brothers, Colt Grand National, Hoyt Medalist, Root Pendulus, Howatt Del Ray, and the Pearson Lord Mercury...they were all deflexed risers.