Funny...
I am currently using a C-Pig with my Lp Baritone (the loger scale with 27,75 might make a difference tonewise), tuned to G#.
I do not have the flubbyness problem you describe and the pickup is not really loose ... it is just not as tight as the Painkiller, but pretty tight!
Maybe the source of the problem is not the Pu itself?
There are tons of things to concider, if you wanna have a really tight sound that deep!
Like for example Ampsettings (the C-pig is hot and the tuning deep so don't "overgain", not too much bass ect...), stringtension ( I play 13-72 Strings...), the heigth of the Pu (maybe you could play a little with that? Tweaking the position of the pickup was really important to get mine tight), ect...
If that doesn't help, I'd really go fot the Painkiller ... it's a veryvery tight pickup!