Oh no heatsink... duh didnt catch that. You could always add one, wouldnt be hard to do with a thermal pad and small HS. Definitely worth it.
I suppose you could flood the cooling tubes with thermal paste and then add a heatsink to the top of them... It's not the *best* solution but it would work if there is a flat surface under the heatshrink.
its not worth tryig to remove the water cooling plate from the esc and install your own.. just get a mamba max and mod it. same results with better parts support.
IDK, but I might pick up one of those hextronic things, I'v got a nasy habit of frying esc's before I race