I am not sure humidity is your problem. Here in the desert it is usually pretty dry (today was 5%.....lower than normal). I will run into a problem once in awhile gluing wood from some of my scrap box, which may be quite a few years old, and well dried. A swipe with a damp cloth will solve the problem. My guess is that you have some CA that is old, or you are gluing spruce or pine, which sometimes are slow to accept CA, or maybe you have some gaps in the joints? Try a new bottle of name-brand medium thickness and see if things get better.