Help me diagnose my miss over 4500rpm.

As to the reluctor gap;
The spec is .008 with a non-metallic gauge
The actual working range I have seen is from zero to .035.
The vanes on the reluctor just disturb the magnetic field which triggers the ECU to fire the coil. I have seen very few pick-up failures; even with the pole piece machined down a fair ways by the reluctor. The size of the gap didn't affect anything on my engines, but when the gap gets to be too big,I guess the signal gets erratic, and the ECU reports on that right away.On mine that started happening after .035.
We use a non-metallic feeler because the magnetic pole piece attracts the feeler, and the vane thru the feeler, and then it gets difficult to figure out if the gap is too tight because the feeler is dragging,or just dragging magnetically. You can put anything in there you want, as long as you bear that in mind. IMO, the gap ain't nearly as critical as one might think.
One thing that probably is important is the condition of the top bearing/bushing, cuz if the reluctor vanes are moving closer and further from the pole piece, I suppose that could create spark scatter. But to that I gotta add, my factory smogger-teen D is from 1973, and has plenty of wear in it. I'm pretty sure if it was a point-type D the engine wouldda quit running maybe decades ago.lol
BTW, the ECU has to be well-grounded. If you insulate it from the apron,the engine will not start. I'm gonna guess that more than a few ECUs have been thrown away because when the new one got installed, it got it's ground back, and in fact, the old one might have just needed it's ground restored.