Re: Dod250?
I don't really think of the 250 as an overdrive as much as a boost with a little hair. Don't like 'em. Think of it as the missing link between an MXR Micro-amp, and a Tube Screamer. If you want boost either a) Get a microamp for 20db of pure loud or b) get a screameror whatever and set it for clean boost. Almost any real overdrive sounds better to me - TS9, Turbo version, Blues Driver, so on and so forth...
Remember - Malmsteen is a particular guy. He is using late 60's Marshalls, which are also particular amps, and they are set up a particular way, with his particular guitar/pups etc. He uses those to goose the preamps and add high end. The few I've heard/played sounded awful to me through everything....
I don't think a classic 30 needs any help. Particularly not from that pedal....