Changing the oil pump without knowing if you actually have a problem might be a bad move. Until Harley actually fixes whatever is causing the sumping issues, as opposed to "try this and see if it works", you might be inviting problems.
The oil pump issues on the M8 haven't just been about sumping with 117 kits btw. They've had low/no oil pressure issues on stock bikes, and I've read a few posts indicating a sumping problem on bikes without the 117 kit. When was your bike actually built (should be a month and year on the certification label on the frame if you don't have the actual date). If it was built early in the model year I would expect a higher probability of a bad pump versus a unit built late in the model year.
JMHO - Jerry