off the top of my head.
LDC/Freeti trash
CoM 3rd
Hole small group
Seb small group
Geonids WL duo
Spiders Velks duo
Other spots.. start there and scroll down slowly:
https://wiki.project1999.com/Per-Lev...ng_Spots_50-54
Thanks to Loramin for that page
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Edit: keep in mind you can get exp from mobs 15 levels lower than you. But higher level mobs do generally grant more exp. risk vs reward.