Two ideas there: that those 3 transistor models with a "buffer" might do better...
and that FF "tend" to bias their Q2 lower than tonebender mk1.5... also mitigating....? And a lot of those 3 transistor models have a diode that also *helps*?
Sorry; I know about nuisance threads where the asker slowly dances around the realization that his question reveals he doesn't know what any of the words he's using mean, or how to ask a meaningful question, or how to evaluate a source of misinformation... and/or asks a question that has been hashed out in a years-long thread from every angle...
I only have a couple of Ge fuzzes in the house now, a Buzzaround, a TB mk3, and a Buzz-alike. I am looking at my box of Russian Ge and wondering about what to try.
I tried the Buzzaround. I didn't have a hair dryer so I used a heat gun low setting, and after a few seconds...no fuzz, nada, I killed it! After a few minutes it faded back, a little less splatty and gatey as time passed. A few seconds with an ice cube and everything was OK again. I repeated with less heat.
My cheap multimeter is not doing temperature so I can't really quantify what is happening...
but maybe shoot for something that functions between say, 55 and 112F...? Here on the mountain or down in Palm Springs...
The TB, a pal took it the studio and loved it, then tried to show me at home his new sound... and couldn't find it. It is a three transistor model with diode. Maybe add a bias control to it and listen....