I recently swapped my DR hi beams for DR Long neck strings on my Marcus Miller 4. Interestingly, I got more overtones from my E and A strings, most of which I don't really like. Its like I have a chorus pedal 'on' most of the time!

Through searching I read that excessive pickup height could lead to added overtones, but lowering my pickups didnt really help.
So my question is this:
Is it the Hex core or the tapered ends causing this? Or worse, are my ears decieving me?
