So ive tried the purple glue.. it works ok.. not for large prints like this.

the curling doesnt happen til there are dozens of layers down, so yeah, its keeping warm down there.. I think too hot to be honest.. i had the bed at 110 c (hotter the better right? ) .
im running this print now with those selective brim circles and 90c bed... It seems to be holding now about 1/2 through a 7 hour print.. Ill post the results when im done.
Problem i find with most regular brims is they arent attached to the print well enough and the print can break free... so this works better for me .