CB Performance Black Box review - PLEASE, DO NOT BUY THIS STUPID WORTHLESS GIMMICK.

If you have a magnetic pick-up, I suppose that you know that they are directional. If the polarity is reversed, they sorta work just as you say.
If it was me, I would reverse the polarity of the pick-up, just for kicks and reset the base-timing. Then try again. I think you will then be able to open up the reluctor gap back to something more sane.
You cannot hurt the amp, by reversing the pick-up polarity.
Best of luck