I've had all sorts of the troubles your describing here lately. I tried some ethanol-free gas and it helped some. I put a jumper hose between the bowl vents and cut a few slices in it near the top of the loop which helped some too. My latest trick is I've wrapped the bowls, fuel pump and fuel lines with space blanket. It looks funny as hell but seems to have worked. Up to 85 degrees ambient outside and no flooding. Todays pump gas just doesn't work well with carbs. I'm almost ready to try fuel injection. Almost.
"They can't arrest us all"