I RTCP and have never had a crumbly batch thank goodness. It generally takes several hours for gel to start so if I do put it in fridge or freezer I don't a problem avoiding gel. I don't insulate most of my batches as I always use some kind of milk or even coffee or beer and know the sugars can also increase the temp when gelling. I do gel most of my batches though as I don't have a lot of extra space in my freezer. You just need to try and see what works best for you and your recipe(s) as differend recipes and fragrances can react differently.