Interesting specs on those motors:
Specifications:
Model: GT 2820/05
RPM/V: 850KV
No. of Lipo Cells : 2-4S
Max Watt : 656W
Max Current : 41A
Weight : 140g
Motor Dimensions : 35 x 46.5 mm
Stator Dimensions : 28 x 20 mm
Shaft diameter : 5 mm
Shaft Length : 17 mm
Max thrust : 1650 grams / 3S - 2300 grams / 4S
Recommended model weight : 1650 - 2200g
Recommended ESC: EMAX 50A
Recommended Propeller : EMP 12"x6"
Considering that a 50A ESC is recommended, and that you plan on using an MK FC, are you planning on using an i2c converter? Or instead, since they seem to provide nearly twice the power of an MK 3638 (wattage-wise, anyway) do you plan on just using the 30A MK BL 2.0?