I was having some of the same problems with my ported shee. I couldnt seem t pull on the hills very well. I took the machine to Wildcard racing and was getting a 4 mil done. Foundout I had big electrical problems. Turns out I had lots of problems with the elecrtical starting with the CDI. Get that stuff looked at (CDI, coil, stator, and flywheel). If the electrical isnt giving everything it should your bike wont either. Just my thoughts but it does sond a lot like what I had going on.
By the way Wildcard fixed all my electrical issues and did the 4 mil and now my bike SCREAMS.