Hard Starting After Warmed Up.....Arrrg

I thought the timing with the vacuum blocked off was the reading of the "idle" reading (which is 12°) and the total (24° at 3000) with the vacuum still blocked off added together.which would mean 36°.
You ain't gonna get 36° with this motor at even 4500 with the vacuum advance blocked off.
I have never touched the dizzy. I don't know if it has ever been touched. The PO didn't say anything about the modification of the dizzy.
Am I still missing something here???