I went through this last spring. The following was my final posting on the subject:
When I last posted, I was waiting for TBS needles ordered from the local Triumph dealer. I put the TBS needles in last weekend and finished tweaking the pilot screw adjustment this weekend. I could not asked for better results. Runs great running up through the gears and at all throttle poditions in between. There is virtually no popping and backfiring on deceleration. Current modifications and setup are: EPCO pipes, AI removal kit, Freak, 160 Mains, 45 Pilots and TBS needles with no shims. Pilot screw adjustments are at 2.5.
