I am no expert here but....
Dont the boots have different size opennings? Could one be backwards causing the leak?
I noticed this when I did my re-jet...one boot went on no prob and the other one wouldnt tighten...removed and flipped and no problem after that.

SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq NEW: 19 Goldwing Tour DCT