aftermarket reeds on stock cages is a good option i cannot tell the difference between them and my old vforces.
Rather than waste money on a coolhead, put it towards porting. mill the stock head .030 or so and have fun.
the only reason i knew my crank bearing went out is it trashed the top end when it did it
tear it down and have a look inside everywhere. it will be cheaper.
no because you didnt even make an effort to check on the stator and pickup like was mentioned. people wont help you if you just rule out stuff like that. you have to help yourself here. Ive pulled my side cover off and found it full of sand even though its sealed.
sounds like you need to spend some time adjusting the head pipes. they fit snug to the frame (something thats rare with banshee pipes) and will take a bit of time go setup properly so everything slides together.