I use all 5 positions on most gigs, but #4 (inner coils) has been my long time favorite.
However, lately I've been spending a lot of time in #5 (neck pickup). I'm finding that that position sounds GREAT with a low- to medium-gain OD with a some high mid boost.
I'm pretty stoked to explore and experiment with all the tones. I see some deep dives in my future.
