Sound advice from all posts.
I would carefully turn the pilot screw in (clockwise) counting the number of turns to see where it is at. Turn back out to the initial setting and then increase (turn out) by about 1/4 turn then test and continue until desired results, or like someone else mentioned, until you get up to 3 turns out. Then its time to get the next size larger jet.
Also the comments about the exhaust are true, can cause deceleration pop. Also if you have an intake leak, this can cause all kinds of fits.
As MX724 stated above this is a fuel adjustment not air. General rule of thumb. If the Screw is on the engine side of the carb it is a fuel adjustment (turn out richer turn in leaner), If the screw is on the filter side of the carb it is an air adjustment, and Opposite results (turn out, get more air, leaner turn in, less air, richer)
You may try LOWERING the CLIP on the main jet as you may have an overall lean condition (this will raise the jet in relation to the slide) and richen the overall fuel mixture. This would most likely be the casee if you are getting the popping but still have good bottom end response (no hesitation or bog)
If you know someone who can reed a spark plug this would be the best place to start and eliminate some of the guess work. HOPE ALL GOES WELL. GOOD LUCK.
PS. If you already installed a larger main you may run too rich, poor overall response, especially when temps climb you may need to raise the clip on the main jet to lean it out a little / just FYI.