The members here on the forum are way more aware than the people in the FB group. You can post it 100 times there and people will still ask. Guys here on the forum are OGs and mostly use the site sponsors for parts and services. We appreciate it. I wasn’t meaning it like we don’t care. These guys just know already.
You're not letting us know anything. We've known for a long time.
We have a whole list of approved sponsors here: https://www.bansheehq.com/bansheehq-sponsors/
That sounds like a CDI issue. I have seen that exact scenario many times. Bike will start and idle perfect. It will rev out clean in neutral. Then, under a load it runs like shit. Do you have a CDI you can swap it with to test?
Go with new sprockets and chain from Driveline.
https://drivelineperformance.com/yamaha/banshee/sprockets/
https://drivelineperformance.com/yamaha/banshee/chain/