Matt, I'm assuming you have tried turning the horiz hold coil back and forth through the whole range?
The coil and slug type control can be tuned through the range till the picture flops over several times at different frequencies, sometimes you have to go quite a ways to get it right, i.e you have three pictures now but if you turn it far enough it'll flop over and become two, farther still and it might flop over and become a single picture.
Edit: Never mind, I see Phil tried that.
