I faced the same problem, only I already owned the "35 foot" slip which had a maximum allowable length of 36'11" (they give you out to the finger piling.)
It was either not buy the boat, or remove the pulpit.
Without the pulpit, I get 36'6" or 36'7". It's hard to know exactly. I should measure more precisely while it's on the hard.
I'd estimate the angle of the transom taking up more length than you did. If you sight straight down there seems to be quite a bit less than a foot showing beyond the aft edge of the transom.
In case anyone was wondering, I covered the area where the pulpit was mounted with a sheet of Starboard, cut to shape, with a center section which hinges up when I'm in the slip. The anchor roller is attached to this center section. Once I confirmed this works, the center section was replaced with 1/2" aluminum. It gives it a slightly snub-nosed look, and I've been accused of mutilating the boat, but this allowed me to keep it.