The link below is your bible if you want to do bubble buckets. I did my first successful setup last year. Feel free to ask any questions.
http://forums.cannabisculture.com/forums/ubbthreads.php?ubb=showflat&Number=654343&page=2
Howdy,
Try turning the humidity down 10%-20% and temp. if possible by 10 degrees near the end of flowering (when your satisfied) to force the crystals out.