cool in my shop today we only do race units after 40 years its now fun to go watch and i dont have to work so hard

as a rule of thumb an assembled drum if you shake it you can hear the clearence and doing the same units over and over you can get to feel the correct end clearence i am sure you know what i mean

when no info is available we use .010 thousands for each fibre as a max in a stock unit

put a gage on it / it sounds as if the standing pressure is way to high 55 pounds comes to mind old school dont know the BAR thing - i dont remember for sure but if it is 90 instead of 55 it will make it slam -
my guess you went the VAC route and checked it but modulator is after the fact

when i did my 300 D 722.2 i think < i moded the high clutch disc count added one by cutting the piston back on the lathe and reducing the spring count, could not help myself < powerglides in drag cars we do all kinds of stuff hahahhaahhahah good luck but it sounds to me its all in the valve body to working pressure that is not doing it for you

i can go and look in my papers on these units if i fine something interesting about pump pressures and adjusting it i will get back with you -- jz