I use GHS Brite Flats on my Les Paul. A bit brighter than other flatwounds and still have that smooth flatwound feel.
I really like the Dracarys...I can get a great smooth high gain tone from it. Also I like distortion pedals with a lot of bass, and the Dracarys has that. The 3-band EQ and the tight/open switch work really well. I haven't tried as a preamp.