Maybe ask Bert Baker?
I drove 10 hours round trip to his place twice to drop it off for work and sat there over an hour or two both times. I asked to talk to him, and he never bothered to stick his head out. He's easy to reach when you're a prospect. Not so much when you need warranty work.
Anyway, mine had Spectro 75W250 originally but they said it was fine to go to Mobil1 75W140 Gear Fluid, as I couldn't find it local anywhere. I think I will try something else and see what happens, but I agree the oil shouldn't make much of a difference.
I think the only question that really remains is if there is a way to adjust the throw of the hydraulic clutch for a little more clearance. As mentioned, the brake fluid change did help about 50% of the issue, so If I can adjust it some how for a little more travel, that might do the trick? I dunno. Transmissions are totally foreign to me.