I finally found it! Ok, so I got a Boss Metal Zone a few weeks ago, and really wasn't that impressed. I also have an MXR ZW-44 overdrive which I love to bits. Here's what I did. I plugged my Classic 50 into my Marshall 4x12, turned the clean channel's volume up to about 3-4 o'clock and the master to taste, which gives me a really fat clean sound. Then I got the metal zone set for somewhat of a good rythm chunk, then I turned the gain all the way down and the level all the way up on the overdrive and the tone around 12-1 o'clock and kick it on with the metal zone to give it a really tight and sharp distortion. Oh, and the gain on the metal zone is around 10 o'clock. Nothing extreem in the gain department, just a very tight, crisp, chunkey, not the least bit muddy, cut straight through the mix distortion.

Here's how my effects chain is set up:

Guitar-->Ernie Ball volume pedal-->Cry Baby wah-->MXR ZW-44 overdrive-->Boss Metal Zone-->Boss CH-1 chorus-->Boss DD-3 Delay-->Digitech Digiverb-->amp Boss TU-2 tuner in the tuner out of the volume pedal.