Output wise, I think a DD would overpower a Sentient neck in the middle position.
But I do believe the different output impedances have an effect on how the pickups blend in the middle position, not just the actual mV/dB ouptut, right? AFAIK, the balance tends to go towards the lowest DCR pickup, correct? Which is exactly why you usually can't get usable middle position sounds out of an acive/passive pickup set. But someone more knowledgeable might want to chime in.