The Green Goblin: I'm with the others on that throttle setting. 1" open is about 7/8's of 1" too far for an Armstrong start on a -520 or indeed any big-block Continental or Lycoming IMO. I'd use 1" open to prime, then just barely crack the throttle for the start.
I used to just push it far enough forward that my pointing finger was straight touching the dash with my palm on the throttle head.
On the A36 I would prime fully open for a second or so then close the vernier and give it about 3 half winds forward.