sputters throughout the powerband on my bike. put same carbs on stock bike with shearers and no problems, ran great. put stock bikes carbs on mine with same issues. drag ported cylinders, shearer oof, vf3s, stock carbs (330 mains) needle in middle, stock pilots, air/fuel 1.5 out, +5 timing, 111 octane w/ castor. 175 psi per cylinder. any ideas.....