I have the X438 on it and it was getting EXTREMELY hot- but I also realized that the boat was too nose heavy, so that probably wasn't helping any. I will tell you, it "looked" a lot faster than the 31mph that shows on your chart . My hydro was 42 on GPS and this doesn't look 11 mph slower in back to back runs. It may be though, who knows. Thanks for posting that though, it gives me a couple of other options.
Joe