As always with every thread about this.
Get the TIMING figured out FIRST!!! Timing ALWAYS affects carb, carb rarely affects timing...
Lots of "carb" issues are really rooted in other systems problems.
Is this thing fouling the plugs while idling? Does it smell like a fuel truck out the exhaust?
Find the maximum initial timing point that the engine will still start when warm, so you know that limit. Unless the cam is REALLY big, 16-20 initial is usually a decent range to run. It takes work to get this right. Lots of people live with sub-standard tune ups because of laziness.