also the basement will over heat as 3800 watts = about 19000 btus.
It will produce much more heat than that. Most gasoline generators are 25-30% efficient, so the actual heat output will be 11 kW+.
I think the easiest, quickest fix is just for OP to lower power intensity on his machines.
Yes it is. Or increase breaker unit component providing cabling capacity allows for it.