Hard Starting After Warmed Up.....Arrrg
The crappy pump swill is without a doubt an issue.
I have posted this before, but I will again.
A couple of summers ago we were having a rather hot/humid stretch of weather, and I was having hard start issues. I swapped out my TQ to a Summit street/strip carb and it helped a bunch.
While I was at it I decided to conduct an experiment, I took a cap from a spray paint can and put about an inch of gas in it (around 3 in the afternoon) and set it on the workbench. It was hot and I decided I would go in the house.
I came out the next day (early afternoon) and checked the cap to find that it was bone dry! That one inch of gas had evaporated in about 22 hours.