IME, the Keeley two-knob and Dynacomp types can be a struggle with anything hotter than low output PAF types. I was always trying to turn the compression down...from zero. I've also had the Diamond, Analogman Bi-CompROSSer, Barber Tone Press, and Carl Martin. I like the Carl Martin most by a lot but it has a power cord (at least the older ones do).
If you want an old Keeley 2-knob I have one for cheap. No paint or anything on the enclosure, just aluminum with labels (it's a very early one). I also still have the Tone Press but only because it doesn't work.