Vessery seems like a bad fit for Vader and Fel.
He's the only one that isn't PS 9, for one thing, and for another he prevents either of them from achieving true unkillability.

Every time I play vessery I find myself thinking about how great he conbos with phantoms and end up pulling him for another phantom

the lack of target lock for soontir will hurt, and I have a similar list in the works but using marek stele instead of fel, more reliable target locks, better output for vessery and more crits from stele and vader.