How do these motors compare on a 4S setup? I know, I'd like to go with a lower KV setup, on 6S lipos, but I don't have the money to get all new lipos, etc. right now. So, I am looking at a 2050KV motor, and a 1900kv motor. Remember, this is on 4S. Right now, I am running 2200, and it's a bit too much. Would the 1900 not be enough? Would it be just right? What are the pro's and cons of each? Thanks for any help, and input.