PRM is crazy good already. 
It doesn’t need buffs. I don’t know about this set in particular, but @mad_lee has a build with it https://forums.crateentertainment.com/t/1-1-1-2-1-2-1-3-expelliarmus-easy-sr-30-31-sr-36-ravager-crate-prm-mage-hunter
So it can’t be that bad.