I share your frustrationwith the gusty day conditions. I have had such days flying full scale aircraft where a mishap could be even more costly than crashing a model airplane. My comments are not so much theory as actual experience holding a stick or wheel in my sweaty hands. I think you misunderstand the term "stability". It doesn't mean tranquil calmness in the midst of turmoil. It merely means the "tendency" to restore original conditions after an upset. As far as aircraft go I stand by my remarks. An airplane with less longitudinal stability will not be affected as much by sudden gusts of wind as a more stable one, and with less lateral stability (dihedral effect) won't be affected as much either. High wing loading with a faster approach speed helps also. The more maneuverable aircraft responds to control inputs correcting upsets faster and with less trouble than a less maneuverable one.

Full scale or model, there are obviously some days that you shouldn't fly. On days with not quite as violent "turbulence" as you experienced, it is possible to fly and have fun. None of this alters the fact that an airplane is not affected by a steady wind, and yes that condition sometimes exist when flying model airplanes.

Thanks for telling us about your experience and I'm glad you got it down with no damage.