So the DLX doesn't overwhelm the regular P90 output wise?I have also a DM DLX (bridge) in the... neck position of another guitar: it sounds good and is a perfect companion for the mid pickup, which is... a regular P90. That said, the DLX has its own tone: it doesn't sound like a P90. And it needs a no load tone pot in my guitar. Was too muddy with two 500k controls.
The Duncans sounded like CRAP when I first got the guitar, after inspection I found that all the pots measured about 400k. That made the pickups respond like the tone control was turned all the way down all the time. Changing everything to actual, measured 500k did wonders. You wouldn't think that 20% would be night and day, but it was.
Mostly what I'm looking for is to preserve that single coil flavor those P90s have, i.e. nice, bright thwack on the low strings and some zap on the high strings. I really couldn't care less if it sounds "authentically vintage" because those Duncans sure don't, and they are fine if it weren't for the hum. I definitely dont want to end up with a bridge pup that sounds anything like a strat bridge though.