Ive got a 3 ton older 10 seer trane and a goodman 3 ton coil. With the .71 piston size my evap seems to be starving with only 3or 4 inches on bottom of A coil cold. I think the a coil needs a bigger size orifice. any suggestion on what size to exchange piston with to increase coil capacity. Suction line not getting as cool as needed at the service ports.