Re: Seymour Duncan Custom Custom Magnet swap
The Custom Custom, The Custom and the Custom 5 are the exact same pickups, but with different magnets. The CC is obviously A2, the Custom 5 is A5 and the Custom is ceramic. Going from A2 to A5 to Ceramic will give you increasingly tighter bass, and sharper more defined highs. The ceramic will boost the mids a bit compared to the A5, but IMO is the sharpest, hardest sounding of the bunch. It may be what you are looking for, maybe not.
At any rate, experiment and see what you like. Also consider A3, A4, A8 as well as roughcast versions of A2 and A5 for different flavors. Somewhere in there is likely to be what you are looking for, if you are looking for a semi-hot pickup.