when you tried the YJM, did you have the EPA set low? i have found that it seems to lose quite a bit of gain and liveliness when you have it down at lower volumes. the boost can be used to wake it up a bit, but it does need a bit of volume to really come to life. it's still vastly more controllable than an old Superlead, and it can sound good at remarkably low volume, but you can't quite get full on plexi tone at bedroom volume.