I do find that there is a fine line between having enough bite and sounding brittle with this amp.
Exactly my findings with the Savage 60!
I don't know if the Savage 120 MKII reacts the same, but in my experience with various Engls, running the Channel volumes around noon or higher and adjust the master to taste, typically sounds better than having the channel volumes around 9 'o clock or so.
One caveat: the e670 SE (EL34), while also sounding better with the channel volumes higher, overloaded the FX-Loop with pedals. So I had to run the channel volumes lower (in the 9 to 10 o'clock range) so that the pedals in the fx-loop wouldn't sound too dark or murky.
I haven't found the two crunch channels to be anything worth writing home about
Not even Crunch II in Hi Gain mode with Rough engaged? Still too lacklustre compared to the Lead Channel?
For me it was almost the same with the SE EL34; Clean=great. Crunch=kinda tame; I wanted a bit more classic Marshall from it.
Lead I and II=both with over the top gain; while sounding great, both were too much in the same vein instead of one being more rhythm oriented and the other more lead.
With my Invader 100, it's different; Clean channel=lovely, open, Fendery, jangly, doesn't distort with humbuckers, unless you want it to.
Channel 2 (Crunch/Medium gain) sounds very good and versatile, but too smooth and 'well behaved'. Could've used more Savage rawness.
Channel 3=typical good Engl high gain rhythm/lead tones. Not much to complain here.
Channel 4: leads only, but far too wooly and saturated. Instant Santana stuff... Almost like Engl tried to do Bogner meets Recto-tones.
To put it this way; if my Invader's Channel 2 was the Rhythm/Lead channel of the Savage and Invader's CH4 was the SE EL34's Lead channel, it could've been a desert island amp.