Here are the pics with the bolt all the way back to where the striker engages the sear:
The cupped face doesn't sit "flush" with the feedneck when it's pulled all the way back, it's slightly recessed. I actually prefer this if I'm using a grav-fed hopper. There's a little more room for the ball to wiggle into the breech versus just dropping straight down and possible not making it all the way in before the pump stroke finishes.
I'll be testing it out again this Sunday with my repaired sear spring and the stock bolt pin.