Sounds like the issue you're having is when you send a bass heavy signal into the pedal it overloads it, making it sound bad?
I had the same issue with the Supercollider and Pickle Pie B in conjunction with my high output BB415. Those pedals would sound great with my Precision but didn't respond well to hot signals, which is one of the major reasons I've stuck with the EHX BBM. I did try the Tall Font Russian as a smaller alternative, it takes hot signals almost as well as the BBM but I hated the blend on it (it's available with a built in blend like the Pickle Pie), it sounded like it was out of phase.
The Tarkin has got my attention!