I was just a spectator not a participant, so no documentation. I believe your sump is the one with unequal length tubes and the Carb located aft on the sump instead of in the center ? The early 320ís used this sump and the Pipers in the certified world (Cubs) are stuck with it thus the inserts to deal with the roughness and unequal flow distribution. They make a special part # carb for the Carbon Cub to improve this problem, and I happen to have one that was going to go on a TriPacer. Another option is to upgrade to the latter sump which I have several.
Trust me your not the first to pull your hair out trying to get good numbers with this set up. Email me at : theduff at EarthLink dot net with a phone number if you want some help.
RV-4S (slider) Builder and 1300 hr RV Pilot