RE: 21x14 or 20x13???
I use 3 different flight modes for various maneuvers. My throttle atvs vary between flight modes. Amps max out around 70. Sometimes up to 80 depends on how hard I get into the throttle. Masters I average around 3600mah, 4000mah on windier days. I don't really care what the amps drawn are, as long as I'm not burning up the batts by the end of the flight.
I'll rephrase that: As long as the amps are within my system perameters I don't care what the max amps are.