If my Timmy, TS or Klone of the moment can't get it done, the Way Huge Green Rhino will.
It has a knob to dial down the bass for tightness, and another knob to dial where the mids are, for brightness.
It'll make any amp's flabby ass tighter than a frog's underwater.
I probably have 10-15 different OD pedals, and the Green Rhino MkII is definitely one of my favorites. Not only can you tweak it a lot, but it has a feel to it that kind of blooms with you. So many of the OD pedals (especially those without input/output buffers) can feel really flat. The BYOC Green Pony is another one of my favorites. It is based on the Maxon OD820.
I have several clones as well. I am always building stuff, lol. Partially because of this thread I bought the parts to build clones of a Duncan 805, Savage Drive, and Precision Drive.