I am at a loss of what to tell you. I agree that they should be talking with you to solve your issue. I however without getting more information about your setup will not make any assumptions that Dualsky puts out a poor product. I have been flying a 6355DA-12 motor now for over a year and am very pleased with it. I am running a OS 1100HV speed control with timing set to 25 degrees and the brake at 15%. The prop being used is a Falcon 19x13 3 blade prop that has been cut down to 18.25". The motor is always cool after landing.

I would be interested in knowing what your timing is set to, what size prop you are running and would like to see pictures that show your cooling air intake and exit. Being that your motor is 220KV and with running 10S the largest prop that should be run with that motor would be a 20x13.