I fly a Ziroli Corsair and a Hostetler PT-19. For both planes I use channel 6 (knob) for the flaps. Flaps are used only for landing and are fully up or fully down depending on the wind. On both planes I mix in a few degrees of down elevator with full down flaps to counteract the ballooning effect of full flaps. I would much rather pull back on the stick when landing than push forward. Just personal preference I guess. With the flaps fully down the servos are setup to operate at their maximum mechanical advantage, that is, minimum current. My transmitter is a Futaba 8UAFS.