Good that you found one that works for you. I've noticed that a lot of my dirt pedals also sound "wrong" through my SS Roland Cube 60. My Artec Soloist Distortion probably sounded the least odd to my ears through that amph.

Have you thought about or tried running a larger cab? I got to hear my 5w Blackstar through a 4 x 12 a couple days ago, and was astounded at how loud it can get when it's pushing that much air. Needless to say, it's a very "big" sound as well.

Good luck at the gig, looking forward to seeing the clips!