If you want to get a cleaner sound you could do Emerald/Mule/Irish Tour, again as a calibrated set. How old is the Duncan JB? If t is a new one, I find them pretty muddy, but I have a very old one (double creme*, no name and PAF style coils), which is sort of like the Emerald but without all the harmonic content!
Another option, but a totally different sound, night be Crawler, HB size P-90, Irish tour. I was going to put this in my PRS EG (with normal size P-90's), but went for 2 P-90's in the end. I love the combination, but it depends how much you use the middle humbucker and whether you want to get the P-90 sound instead.
But really the man to ask is Tim. He will go through the music and sounds you like, and then come up with the best combination.
Cheers
Phil