Hiya Gooch,
My Stormies only 'migrated' through my S.G. for a short time, but I really liked what I heard. Very sweet and clear. They were warmer in the S.G. than my Les Paul, but still very nice in both. As Twinfan commented at the time, it was probably the maple cap on the Les Paul that produced a brighter presentation. For all the S.G was a relative 'lightweight' compared to the Les Paul, the all mahogany construction of the S.G's body and neck - warmed things up even more. I can see why lower powered vintage pickups or completely the other extreme is recommended, as I can imagine the S.G. would have swallowed up the tonal attributes of the 'middle ground' pickups.
I am sure you will enjoy it, a real gem of a pickup ! :)