As suggested above and because it starts fine when cold, you should try to lean off the idle circuit.
Try first adjusting your idle mixture along with the idle speed adjuster - you will notice an improvement just doing this and it will tell you if you're going in the right direction. Then you can play with a smaller idle jet. As a rough guide, 2.5 turns out or more on the mixture screw and you need a larger jet, .5 or less and you need a smaller one.
Because the carbs circuits are all interdependent despite what all the carb manuals say, it may be that you need to change not only the idle jet but possibly the main, or the needle, including position. On balance, if you have something like a 33 idle jet already, then you should be fine with that and may actually need to lean of another circuit such as the main or drop the needle.
The other thing you may want to check is the auto-decompressor adjustment.
HTH
g.
