smooth? as in the distortion has no grittyness or crunchiness?
Okay, you will notice that as you increase the gain knob on any amp, the distortion goes from clean, to crunchy, to smooth. With high output pickups like an X2N, you should turn the gain knob lower in order to maintain the grit.
As for the flabbyness, you need to adjust pickup height. Start by lowering all pickups as far as they can go, then increase height on bridge until it sounds appropriate. To make sure its not too high, plug in your guitar in, and sustain a chord, if its wobby sounding (like its somewhat out of phase or out of tune) you need to lower the pickup. Best tone is usually at the height right before it starts pulling on the strings. Then just heighten the other pickups so that they are at equal volume, but make sure they arent pulling at the strings.
If this doesnt fix it, i'll think of something else.
