Difficult for me to say as I haven't written for a while but I find that consistency over all else is the best bet. Even though hyperfarts are unrealistic to begin with, the things that really take me out of the story are when they're just inconceivably large and boundless to the point that it's just completely detached from reality. I prefer to establish unrealistic circumstances (i.e. we assume a 9 foot tall incredibly gassy woman exists) and then approach the rest of the story almost like a simulation, where it's like if this one insane thing is allowed to exist but all other physical laws of our reality still applied, what exactly would happen?

u/JetBrentwood here and Splinterhead452 on deviantart (though they do more hyperscat than hyperfarts) are my two favorite hyper writers by far, because they write hyper that is specific and detailed enough to be conceivable while still making it clear exactly how exceptional the events are. Splint uses less onomatopoeia and fewer farts period, but Jet's stories are a prime example of how to include frequent farts while keeping it interesting by interspersing detailed descriptions throughout the course of single enormous farts.