for lvl 9 its accurate, we need 74.754 exp to upgrade it, for lvl 8 it was accurate as well
as for the stress thingie .. yes ive noticed that too but since they dont have the option to really farm i just left that out
and in my eyes lotus was far less annoying then odessa .. all of these shooting soldiers -> GROAR DIEEEEEEE
hameln is no reference since its a map to farm on ^^
edit.
oh and here is a vid of sunrunes + me playing around a bit in tower (he wanted to test out his magical exo ^^)