Intermittant starting line bog

At 18* initial I would think it is still set too low.
I would advance it to say 24*. Let it warm up if it still starts without dragging down on the starter, leave it there. If it don't like to start back it off 2*. Reset your Dizzy on the mechanical so it is 34* all in @ 2200 RPM. That should wake that puppy up real good make it crisp and clean and no more stinkyyyy!

Remember...

Timing first then the Carb. Doing it in a different order will have you chasing your tail.