I find vs most amps almost all the Friedman models besides the JEL are pretty smooth and dark leaning. If the BE100 Deluxe is still too much, the only other models I found darker were the BE’s made before 2016 and the SS model. If those don’t work for you either maybe check out a Bogner XTC 101B
Maybe darker, smoother sounding speakers can help too with getting what you want like the Redbacks. The SS I tried was also modded, so maybe a stock SS would differ in darkness. I found Friedman’s to be less fatiguing than most other amps. That always seemed like what they were going for imo