joe,
yeah with muffler pressure it is easier. In my younger days I used it in combat before it was outlawed in SLOW. We would keep squeezing the tank before launch, which was only a sec or two. Harder to do in carrier. I have that setup on a profile scale B-10 with mufflers, and it works but is still hard to get a correct high speed needle, but if you aren't pushing for 70, why not.
john