Holley 1920 carb issues!

Hi,I hope you guys can help me out here. I had the Holley 1920 1bbl carb on my 70 dart professionaly rebuilt a little over three months ago. The car idles and runs fine however I am having hot starting issues. If I run the car and shut it off and then start it back up one or two minutes later,it will fire right up at the bump of the key,if it sit for over five minutes it is hard to start and I have to depress the gas pedal and hold it part way while I crank it until it fires up and then it will idle rough for about 5 seconds and then smooth out and run fine again.

Recently a couple of times when I went under hood later to check oil,etc. I would notice a couple drops of fuel on the intake below the fuel bowl. checked the screws and tightened them,then didn't see any other drops,then today I was checking the oil again and noticed a few drops on the underside of the fuel bowl. I took the air cleaner off and it looked like maybe the fuel may have dripped from near the little yellow button (anti-percolation valve?) on the top of the carb, I tightened the screws gently and drove it again and didn't see any leaks anywhere,but it is still hard to start when its warm and sits more than a few minutes.Does this sound like a sticky float issue?

Unfortunately for me the warranty on the carb rebuild expired 4 days ago so it looks like I will have to figure this out myself,unless the guy at the shop decides to be nice about it.