Some people who work on these things make the mistake of leaving off some shock springs in order to shorten the pedal & knee travel.
That will stiffen up a p/p considerbly.
I've played on Buddys '67-68 p/p a number of times & am always amazed at how great it feels. If you looked underneath "The Blade" & then played it, you would be able to confirm the accuracy of my previous statements. That thing has more springs than a mattress factory

Of course, Buddy invented it & would absolutely know the correct way to make it play its best.

Another thing too,..... on those long lowers that also raise elsewhere, its good to hook the raise hooks lower on the raise fingers (experiment with it),& put 1&1/2 turns of shock spring on the
thinnest string raise rod (while adjusting in the correct ammount of slack to enable the lower to bottom out). Leave the thicker string higher on the raise finger than the thinner one & use a long shock spring on the thicker to even out the feel & help the 2 to start & end together. Shock springs mean just that... to soften the shock of cranks hitting collars at different times. To leave them off adds stiffness & multiple feels of the strings activating....& that is more distracting to me than stiffness.