Welcome Jack !
I am only concerned that the open, clear sound of the Stormy Mondays might just be perceived as 'bright' in certain guitars - despite the otherwise mellow alnico II and low impedance voicing.
I say this, because having had both Mules and Stormys in the same Les Paul, the SMs had an almost acoustic quality, whereas the Mules put some of the mids back in, albeit less emphasised and much clearer than the Gibson pickups that came with it.
Having said that, the SMs did make a 'snappy' S.G. into a sweeter sounding blues machine. The SMs are very level on the E.Q. though, a facet that can be quite surprising when you first compare them to stock or mid focused pickups. The low end is gentle though, not tight edged or overly percusive - more that nice smooth rumbling growl you hear from a bass guitar.
SMs are a very nice and classic sounding pickup - and the type that allows a very clear arena for you to bring your own character into. It's not that SMs are 'wrong' for a Les Paul, it's just that they do not impose a tight reign on you at the outset - they require you to select your guitar and amp E.Q with some though. In contrast, I gather the higher gain pickups might dictate the playing conditions from the outset.
I am interested in Heavier Than Hell's suggestion of an overwound Mule - to tune the top end even more than the intrinsic quality of these pickups do already.
:D :D