Thinking of changing Xotic BB for a RC but.....
I use the Phat Phuk for that exact purpose - slight bass boost and touch of grit. I've got it dialed back internally slightly from factory as my active Warwicks were too gritty. I've recently put it after my vmt ( and Tall Font Russian) and prefer it after my other dirt. Instead of slamming the dirt harder, it now gives the dirt a nice boost in volume and tone.
Warwick Basses, Aguilar, Bergantino, Darkglass Electronics, Wren&Cuff, 3Leaf Audio, Mono Cases.