Re: Gibson 339, hotter bridge pickup
How smooth/fat do you want? I use my bridge pickup for fusion styled stuff mostly, and I really love the Whole Lotta Humbucker for it, though it wouldn't be much hotter than the 57+. It's still fat and smooth, and you can add more gain with a pedal or the amp.
It might be worth looking into the Custom range, perhaps the Custom Custom SH-11, it's maybe 20% hotter than a vintage pickup (give or take), but it still has Alnico 2 for warmth and smoothness. I think, in theory, it would be too warm or muddy for a semihollow, but I've heard two guys play with that setup in ES-335's and they sound great.
You could also try the classic fusion pickup, the Duncan JB. I've only heard this once in a hollowbody but I really liked the sound, though it did really further highlight the nasal quality of the pickup, and of a semihollow in general.