Not trying to give you any grief, but enough paint to do the whole hood is way too much. As an experiment,
try going to the other extreme and squeeze almost all the paint out before you roll. You should do 1/3 to ½
your hood and then be out. That will cure most of your runs. As far as thinning, thin it even more than 50/50.
It took me so long to figure this out that I painted in temps from 25F to 95F ( Feb to August ). Lots of guys
did it in weeks, so I don’t claim to be the brightest bulb, but I am persistent. It will not hurt anything to over-thin
while you experiment. Get all this sorted on one panel to minimize your trouble. I would recommend a door, because
that’ll expose runs if you’re going to have them. And it really will self level when you find the right thinning ratio.
When I had to repaint my fender after my wife hit it, I did 2 coats over the weekend and didn’t sand the last one.
Put the fender on and drove til the following weekend, and did the last 2 coats. It came out perfect.