Sorry I was thinking of pleurodonte marginella (from what I can find pleurodonte and caracolus are interchangeable genus names, not sure which is currently considered correct or if they've been split) anyway the humidity and climbing will still stand, and I suggest that when looking online you also look for info on pleurodonte sagemon.
I had the same problem with the same species a couple of years ago. It seems they would never eat the cucomber that people "claimed" they would eat.. I wouldn't get too bent out of shape over it. Some snails are just a lot different than others and even EACH and every snail themselves. I think your on the right path as long as they are eating steady.
Unfortunately a couple month ago they passed away. I think it was down to the heat mat not heating up enough and the fact that I had a really bad winter (don't have central heating so it gets rather cold)
So sorry to hear that. Yes, tropical snails are usually very susceptible to cold. While you had them did they readily eat vegetables? if so, which ones? I have kept Caracollas but always considered them more of a "scraper"(snails that scrape fungi, algae, mold etc. off tree limbs or limestone rocks)than a "muncher"(snails that eat vegetable/plant material directly).