If you think a 26 that turns a 18-6 Mejzlik 9000 with 17 1/2 lbs pull is underpowered, show me one that's better..Funny, my transmitter is an OLD AM Proline converte to a MicroPro 8000....I fly ALL my planes with Zenoahs, NO shielded cap...NO interference..G23, G26,G38,G62,GT74...Only interference I ever had was from a bad servo..Replaced the servo, problem went away....Have you tried replacing your servos, one at a time ?