Finally had the first opportunity to run my new Kemper through my Marshall 1960a Cab (2-G12T-75 and 2-Marshall-branded V30s, X pattern). I was instantly disappointed. Rigs that I really liked on headphones and studio monitors were brittle and shrill. MBritt profiles (which I hear tend to be a bit on the darker side) that sounded meaty and tubey in headphones were harsh and rather digital sounding. I had to dial back the treble significantly on almost everything to make it tolerable. The consequence is that the main outs then sound way too dark for FOH. Tried cab off vs cab on (sometimes leaving the cab sim on actually helped a bit. Tried 4 vs 16 ohm. I'm really perplexed by how, through the Marshall cab, a lot of the higher gain profiles actually sounded similar... and quite frankly, not very good. I know lots of people use their Kempers with "real" cabs. I hate to invest in a FRFR when I already have the Marshall. Any thoughts? I think I need a pep talk. What am I missing here?