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Hey nevetslab! Did you ever figure out the cause of this oscillation? I've got one on the bench now with the exact same symptoms.
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I've had several Rockerverbs and only one with that oscillation (maybe two). I don't remember exactly the system I used, but in that amplifier the "absolute" sound in high distortion is not with the gain setting at 10 but a little lower (8.5/9...) which allows manipulation to deal with the conflicting segment.
The first thing is to try differents 12AX7 on the input tube since I saw some dependence on the model. I remember I used an ECC83JJ wih medium transconductance. Afterwards, the treatment I think was around the plate resistor of the second triode. I probably replaced the 100K resistor with a 47K/47K divider with the capacitor coming out of the center point.
Of course the original capacitor must be cut since being a box type it is not possible to unsolder it, and a new one must be used.
If I had another one in front of me with that problem I would use that system to try.
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