I can only imagine that all the responses recommending Tekin didn't read the part saying you want to run a 4.5! Surely it is common knowledge that Tekins will thermal after a couple of minutes when running a 4.5?? If not it should be!
Regarding the MMP, A few people including me have tried it running mod in smartsense and it was dog slow. In Cheat it was a rocket but not proven over a race. I found with 5.5 and cheat both the MMP and Motor were hot very quickly.
As for my recommendation, I am quite bias, but for smoothness and driveability you cant beat the Team Wave RB50 or AE BD if you can get one. The SXX TC is the world champ mod esc so I guess its good too.