From what I recall The Fink sitter is a basic hard pull, I found it harder than Stall sitter, but there’s not much to it.
I found the crux of Stall sitter is the crux of the stand, the low moves are ok. The key beta for me was pretty weird but try it, honestly it works. There is an obvious low foothold on the right side of the arete (not the foot ramp obviously), use this with your LEFT foot and oppose it with your right foot on the left side of the arete. It takes all the barndoor out of the move and means you don’t have to pull hard on little holds with your left hand. Great problem.