Was on this on Sunday and figured a great sequence that hasn't been mentioned so far. Pull on with RH on pebbly bit and
left foot (!) on the foothold round on the right, palm down with left hand just above the poor undercut to get right foot onto the best foothold on the arete, walk hands casually up the arete with the flagging left foot curtailing the barndoor. Not too strenuous so links in well to the sitter.
If short or coming in from the sitter you have to work hands up the arete with RF on hold round corner and LF heel-hooking the start flake, then do a precarious foot swap whilst holding a LH undercut/sidepull just above the start flake.
This beta is gold-dust. Yes I do accept cheques
Also did The Fink Sitter which seemed harder (two power screams) than Stall sitter. Hell of a sandbag at 7b!! Fin sitter - 6B sit moves into an admittedly hard 6C = 7B. Fink sitter - 7A+/7B sit moves into an admittedly soft 7A+ = 7B. If I was American i might say 'go figure'.
