I don't use any more than about 12 or 15 degrees flaps. On mine, there is no change in stall speed between that and full 25 degrees of flaps, and very little increase in drag with full flaps, and it alleviates the need for all the trim. I have installed gap seals on the elevator and VG's on the underside of the horizontal stab. The combination of the seals and VG's made a world of difference. I use a pressure relief type of trim vs. a trim tab and can relieve all the control pressure. At 50-55 mph it sinks like a rock.