I went with a Seaking 35 amp ESC as my replacement. It is actually a tad smaller than the stock 20 AMP and weighs about the same. I had a chance to run it the other day. All good. I kept the run times to 5 minutes. And due to swimmers and vegetation it was not WOT the whole time. I have a 1600Mah Hyperion, 1800Mah (came with from KC Hobbie) and a 2200 Mah Dynam. I like the 1600 the best. It is the lightest and smallest but it fits nicely and the boat handles best with that battery in it. I love that this boat rights itself. And the seal on the cowl works. I don't tape the cowl. I did change the machine screw that the knurl nut threads on to. I lost the original nut and had no luck finding a M3 .50 metric nut, locally that is. So I changed it to a 6/32 x 3/4" screw and a 6-32 knurl nut , which are in stock at Lowe's. So I have 3 spare nuts now. Any suggestions on a propeller upgrade?
I look forward to getting another Joysway. I hope get one that runs on the same battery, but if I have to buy some 7.4 2S lipos then so be it.