Yes

I have seen extended bulk tubes that thread onto the existing QB tube so you end up with 2 tubes which reach the same length as the barrel.. Your fill nipple is at the end on the cap.

I was just wondering what else could I do for a power increase without doing the bulk setup?

I still haven't removed the 90 degree edge in the exhaust port, I still don't have a bolt probe and I haven't shimmed the hammer yet. Would it be worth doing these 3 extra mods? what would I expect from these 3 mods?

thanks