I just got done building a solid state amp and a stompbox. The problem is the stompbox only works at high volume. Is there something like the power squeezer that Roland has on there cubes that I could add on to the amp to reduce the wattage?
I have this great thing on my amp that helps me reduce the output, it's called a volume knob! /smartass comment

Seriously though, it sounds like you have a shitty connection in the stomp box somewhere. I'd go through and glob a bit more solder on the connection that look weak and give it another try.
Fingers -> Schecter Damien FR -> Fulltone OCD -> ABY Box -> Bugera V22 / Peavey 6505+