I've had issues with them climbing glass too. I never had this problem with Tylototriton but Cynops ensicauda seem to hate the water. Now that I've set my 18 little monsters up in a nice aquarium with Java moss, petrified wood island and filter, most are remaining aquatic or sitting on the rock. I'm quite pleased to say that more than half of my recently metamorphosing group are now ~completely aquatic of their own will. They're even begging already.
I do still get climbers though, and I've had a few scares that my lid wasn't on tight enough. Luckily I've had no escapes yet. I lost 2 of my Neurergus kaiseri a few years ago to climbing/escaping and since that happened I've been very paranoid about it. If you think Cynops are bad, Neurergus kaiseri are like Spiderman, and they will always find that little hole, where ever it may be.