After looking back at the amount of OD's that didn't work with my amps over the years I'm incline to believe that the OD's were not the issue but the bright caps in my amps. In the last several years I've used amp without bright caps on the volume. I even removed the bright cap from a Dr Z. Since making this switch I get great tones from my drives and my clean tones sound more balanced. Has any of you guys gone through the same thing?