I own two Kilotons--a USA and a Tribute. I have argued with myself for a long time about adding a single coil pickup to the Tribute in a "Mid" position, as you have. My plan was to wire the pickups V -V using a concentric pot set for the individual volume controls and keeping the stock electronics the same for the MFD humbucker and passive tone control.. My imagination tells me that I should also wire in a master volume since I prefer basses with a master volume. I could run it down to the lower horn. I did something similar with a Squier Paranormal 54 Jazz Bass I have. But isn't a set of concentric volume pots kinda like a master volume anyway? Sorry, I digress. I'm still in the "arguing-with-myself" stage, and as usual I'm losing the argument. Good luck with your sale! Kilotons are marvelous basses, and I have no doubt that your mod makes this one even better.