I'm not a huge tech-head either, but I think Slashs sound comes mostly from volume... I've noticed that in my experience with tube amps, which is fairly limited you get a little more of a crisp overdrive the louder you turn it up... Without the array of string noises that tons of gain causes. I don't know where you're playing, if its a small room or a big room, but try a little less gain and some more volume. Less noise, and more noise all at the same time... Or maybe if you want put a capacitor in line with your signal somewhere around your volume know and give your guitar a more crisp sound with the volume pot turned down when you go the chords...
I probably made no sense at all, which is normal, but anyway... Just try it...
J.D.
