I'm having problems with throttle repsonse on my bike above about half throttle. When I bought the bike airbox was missing so i put some foam filters on it. Checked a website called carbjetkits.com and they said I'd need 130 main jets, 45 pilots, and 2 shims per needle. Installed them, rebuilt the carbs. Above half throttle in all gears bike sputters pops and won't accelerate. Went back to the stock 120 jets and removed a shim from each needle leaving one per needle. Problem was still there, so i sprayed the filters with K&N filter oil didn't help. What else should I do?