It certainly is a very tight pickup, but personally found the C-pig a tad too compressed for my liking, but it was definitely something I could see a lot of people liking. Then again, if I were you, I wouldn't be going so high-output if you're detuning and want outright clarity. Not that the C-pig wouldn't be clearer than your Invaders. Tim also explained to me that lower tuning = heavier strings = more string mass moving in the magnetic field, which results in a chainsaw-y high-end.
I would definitely consider the Painkiller, and the Nailbomb (probably ceramic). Both ridiculously clear, and very very tight.