Whats the difference from your day and night time temps? I know if its super cold in your room when your lights come on it may cause this condensation. I have larger buckets then the uc's and they are very cool to the touch but I never get any condensation.
My temps are between 83-85... my day and night temps dont exceed more than 10 degrees.
Its not the UC's bro its your environment that is the issue.