If you want to test mobs of a particular level loramin came up with this list, post #49
https://www.project1999.com/forums/s...=437358&page=5
Some quest mobs might be tougher than usual so might want to check them out on the wiki first.
I know chardok has some static-level 53s like di'zok cryptmaster you could borderline charm with boltran. Shouldn't be too long to get a bunch of samples in at 53 but unlike the low level mobs that are too tame to let charisma make a difference, it is possible the 53s are too unruly to see a noticeable difference too.
My chanter is 85% into 59. I'll be able to do some testing relatively soon.