Brandon, to fly optimum AOA (L/D) then you fly AIRSPEEDS. If you have any telemetry at all then AIRSPEED must be the first. There will be two SPEEDS you will want to fly at, the first is 'Best L/D' or 'greatest distance from a height', this will be equal to the models lowest drag per pound of lift. Then there will be 'Best c/l' or the most lift per mph your model will do. This SPEED is somewhere not much above stalling, and will give you the best 'duration from height'. Climb at best L/D, or travel from point to point at best L/D, and loiter, or climb in lift, at best c/l. Airspeed = AOA in these cases, and as indicated airspeed is not height affected, it works at all altitudes. Using a calculated model speed that is independant of altitude, GPS or similar, will have to be altitude compensated. Talk to a full size glider pilot, and you will find that they too fly airspeeds.
Evan, WB #12.