I found something that helps with the sweating issue fellas, I too heavily sweat due to overweight. If you know it's really gonna be hot that day, take a cold shower or bath in the mornings. I do not know why it works and have even tried googling why it does but for over three years doing this I no longer sweat on those hot days. I also soap down completely before turning on the water. I wanna say it has something to do with the freezing cold, but it could be the soap against dry skin. I also get told I smell like I just took a shower.

I hope this helps

What works for me is trimming armpit hair and buying roller (instead of spray) deodorant.