RE: mega 16/15/4, did i make a mistake?
I don't think you made a mistake but I use 8 1800 mah Hecell or 8 CBP 1800 mah and my wing is very fast, much faster than a speed 400. I just don't think the 1050 batteries are enough and I can't believe they don't melt with a Mega 16/15/3 motor.
I would check the programming on your speed control, hopefully it is a Phoenix 25 that can be programmed from your PC.
Woodduck