[Chrislong]

I don't know about these motors, if you said Novak then id have some idea, but like brushed, each brand is different.

At a guess, start off with the 6.5 geared as you would for a 10 or 9 turn brushed, and the 5.5 a 9 or 8 turn brushed. Try it and check the heat and see how it feels - then adjust the gearing to suit.