Take it to local shop to check timing to be sure it's at 10*, they will probably do it for free. Try higher grade fuel, You need to take care of that balancer issue quick if it's going out, it could lead to very bad things.
Hey Venom I just saw that you had Ultra Lite II's and looking for some 18"s. I have set of 40 miles old, 18" Ultra Lite II's for sale. I just posted them on for sale section. If you are still interested, Let me know.