Castle 2650 Motor on 6s Lipo

I don't see the interest to use the 2650Kv with 6S when you can use the 2200Kv with 6S... With a bigger pignon, the 2200Kv will provide the same speed at a better efficiency and with less amp spikes in the ESC and the battery....

Why do you say this? The 2200 should have a slightly higher efficiency at this range, run cooler, because it's bigger, but the 2200 should have the higher amp draw, when geared for the same speed. .