Except the manual says F10 is for the right pop, not the upper center. Guess you could try switching the pop boards around for those two pops and see if the issue changes or moves but it could be a short in the pop coil too or problem with the coil's diode or it's the wrong coil.

I know I had a problem putting the pinwiki recommended 2 & 1/2 amp fuse in the lower tube kicker but it blew after a few weeks so I upped it to 4a. It uses about the same coil as the pops. Not suggesting you do this to the pop coil, just saying that if your coil has a partial short in the windings it could cause the correct fuse to blow. Especially since yours works for a while and then blows.