Are you running a single petcock or dual petcocks?
If i remember correctly, the quad (4barrel) carbs love fuel. A single will cause you to starve a bit. Running dual you feed 2 on each side, instead of all 4 from 1.
I'm still new to it, but check and see if 2 of your pipes are running hotter than the other 2... Thats how mine was, I have a Sportster tank on my 550, Now set up with dual petcocks.
made new kicker pedal. Used a bike pedal axle and made up the foot part. (Old bicycle is no longer ridable)
Btw, might be a dumb ?, but what did you use for your kick arm to put the pedal on? stock tapped or welded? or did you swap the entire arm?