Run her at 24:1

Adjust the needles as follows. With a helper, run at Wide Open Throttle. Then, turn the high speed needle in, clockwise, until it wants to die down or lose RPMS. At that point, back it back out, CCW, 1/4 turn.

Then bring motor to a low idle. Do the same for the low speed needle, the top one. Turn in, clockwise, until you hear it lean sneeze (what you heard). then back it out 1/4 turn.

The initial static settings for the needles are 1.5 turns out from seated for the low, and 3/4 out from seated for the high. those are the starting points. Then tune from threre.

As stated though, sounds like you need to richen up the needle a 1/4 turn or so. After you have them dialed in, take off the dials, and re install so that they point in at one another. Then tighten down the packing nuts, 7/16" nuts behind them. That will keep them from moving, and having them point in from one another will let you know if they got bumped or moved.