Goodsell Super 7

[Gasp100]

Really digging this one so far - it's gritty and a little "swampy" for me some times, but the tones harken back to real earthy, older, rawer sound (no where to hide . This amp is VERY touch sensitive and the cleans, grit and crunch are very distinct and different.
I am wondering if a different speaker (than the custom built one from Goodsell) might tame a little bit of the raw breakup and smooth out the crunch just a bit. I can get pretty much anywhere I want (except for higher gain) with guitar (LP, Tele or Strat) -> cable -> amp and using the volume/tone of the guitars or amp.
I'm thinking sometype of a Scumback would be killer, but the cab is very small and tight (the OT is about 1" or less from the back of the magnet on the speaker) and I'm not sure what replacement might fit.
Anyone try different speakers in this puppy?
It's also the loudest/fullest 2 watts AND 7 watts I've ever heard. I'd like to think cranked on 7 watts using your guitar volume would be enough for a gig. Maybe not...