Im in the same boat as you, I sweat profusely when I ride hard. My goggle experience has been a work in progress, but I arrived at Smith IOX after owning many different brands. Oakley, Dragon, Von Zipper, Hoven and feel the quality of lenses and venting are best for me with the Smith goggles. I used to have to carry extra oakley lenses just to be able to see. Broke too many to justify owning oakley. Don't have that problem anymore.
So far, all goggles I had (Juble, Smith IO) worked well while riding (fast windflow) even in warm spring conditions, but while hiking they're a no go. I assume that there's just not enough speed/windflow to compensate for the sweating, no matter how fancy the goggles are. As mentioned, even the pretty open sunglasses fog up then.
"Yeah... no, that's not clumsiness, that's just being topographically challenged" ~ Noreaster