Efi Bonneville Random Misfire Trouble

Seeking some advice re my 2010 Bonneville SE efi, misfiring at random throughout the rev range once warmed up, will run fine for a bit then chug then go back to normal and repeat throughout the ride at random.

Over the past couple of years I have removed air box, air injection and 02, shorty silencers with appropriate TTP tune, reset adaptation carried out multiple times.

I have changed coil, spark leads, caps and plugs. Doesn't seem to be any air leaks, have swapped maf sensors and checked hoses etc.

All I can think of now is pickup coil / crank position sensor, I've read many threads on this issue but im seeking some further advice regarding my resistance readings, tested today, cold bike the plug is reading 196ohms. I took the bike for a 20-30 min spin to warm the bike and read the plug again, this time getting 260ohms. Is that within range or would that indicate a failing pickup sensor?

Failing that I could change fuel filter but I'm not overly concerned with fueling, any other suggestions much appreciated before I give up on the thing.

Thanks.