Re: Single size humbucker with biggest low end
I would check the pickup cavity to see if its a swimming pool route, in which case if it were then I'd get an actual full size HB for the bridge along with a new pickguard.
The lil'59 is supposed to be bright I think? Hot Rails would work better in its place maybe. The chopper is bright in the bridge but not as much as a true SC, its very well balanced eq wise, not really bass heavy. TZS, ANS, BC2 would be the ones that are much darker sounding than it, might need to go with 500k pots with them as well.
But before you switch out the lil'59, does the bridge pickup on that guitar have a tone control?