Here's my take, but know-it-alls will correct me soon.
I road on tubulars for over 10 years... never any problem with the latex tubes.
Bought clinchers and tried latex tubes. Had problems at stem.. latex coming apart.

I think latex deteriorates rapidly when stored in a box or out of the tire. You don't know how old they are when purchasing. They are fine in sewn up tire.
So now I use Continental Race Light butyl tubes... they are about the same weight.