You CL400Peavey are a smart fella! You certainly called that one! A wonderful pairing!!!!! I'd never played a Streamliner or Shuttle before but I now see and HEAR why everyone loves them!!!!!
I think the shuttles have a more intuitive EQ, and that the streamliners need a cab with the right mid content to sit in a mix. I also think a lot of people cycle through amps and never like their sound, but have been placing that blame on the amps, and not the cab they cling to.