My 2 cents which doesn't go very far this day.
We need to do some homework ourselves. Relying totally on what is being published may in fact be perfect for one and may be detrimental to others. My continued test in results have me temporarily parked at the upper middle of the road in referance to my own personal set-up.
It may not always easy to discern what Dr. Ashby's studies and results can be effectively applied to enhance our specific needs. We must do some of our own verification.
Different ggp rcommendations are recommended as having a bows maximum efficientcy maximized. Took Dr. Ashby ~17 gpp with a 40# @ 20# recurve to achieve very positive results on the buffs. My arrow speed estimation would be ~144 fps.
Personally I strive for the heaviest gpp, with my 51 -53# set-ups, that I can achieve that fits well w/i my site window at my effective hunting range and still be able to practise at moderatley extended ranges.
Note: Tuned and sharp BH's are assumed and my set-up may be modified according to particular species pursued.
Your own testing and verification will enable you to ascertain what is best suited for you.