It's not mushy at all.....it's not my favorite, but not mushy. What sound do you want? If it were me I'd stay with a pup that has an A2 mag like the PG(b) you've got. If not the PG

, my next choice would be Seth Lover. Really smooth and vintage...great balance. Next would be the APH, although some find it too smooth, I love it above all others. Great Slash tone. I'll post a link to some clips I did with the Seth Neck and the PG neck in my Dean Hardtail. It weighs in at over 9.5 lbs so similar tone to a LP.
My Tunes
Scroll down about 8 songs and you'll see the Seth and PG clips labled. Fairly decent amount of gain on each, thru my JCM 800 miked with a SM 57.