After reading this, I took my pignut out. The bow over time has been retillered, handle added, shortened, soaked with all day rain, stripped, spent a year dying out because it turned into a heavy dog after the soaking, then trimmed down and retillered again. At 5.5" it kicked the arrows around a bit, I put a shorter string on it that gave me 6.5". that smoothed out the bow, lessened the hand shock to near zero and I got perfect arrow flight and tight groups out to twenty yards with 1918s cut to 27" bop with 135 target points. the bow is now pulling about 55 at 26" and shooting faster than it did when it was about 70 pounds at 26", a lot faster.
I would not be afraid of experimenting to find the sweet spot for your bow. The performance difference in my case was surprising.