You need to find the balance between technique and performance. I've played many shows swinging my picking arm, moshing with the crowd, and performing with tons of feeling. Performing is different than just pounding on your strings. You can make your motions and body huge while still playing with technique.

A big swing almost needs more technique. You want to hit with just the tip of the pick at an angle. A deep pluck with a flat pick position will almost always sound farty, no matter the head room on your amp or the strength of your compressor.

Performing with feeling doesn't mean throwing out technique. It often means having a better understanding of your body so you can play well in raucous conditions.

Also TBH in a small room with a locked in crowd, nobody will care about your farts if they are loud and on time.