I have a glass plate with blue painters tape over it, and sometimes I add hairspray. I also use a brim to better anchor the peices down. I think nocking the peice over may have been my fault as there were some balls of fillament collecting on top of i tall and skinny pole that was printing, and I may have loosened it when trying to remove them. Adhesion has not been a problem in the past, but I fell like it is shrinking and pulling itself of the bed or just not anchoring down now...Do you use a glass bed by chance? I've been meaning to pick one up because I've also had bad adhesion, leading to knocked over supports, warping/scraping the top layer (and pulling it off the bed), etc. Granted, I haven't had quite as many issues as you have, since PLA is so much easier to print with, but adding a raft for pieces that use lots of small supports might be worth your while. Failed prints really suck, and when there's a potential for one, I don't mind the extra "insurance" that a raft gives by keeping the supports from falling.