I would agree - it does look over inflated but the dealer said that was the style of that tire. The tire was naturally round like that. Sorry - I don't know the pressure. I'm told they tried to mount the more squared turf tires and it rubbed so they went with the rounded model.
I saw some nice turfs on a B7800 that were more squared but the tire didn't have as aggressive treads - they weren't as deep. Sorry no pics of that one.
The turfs on that B2630 shown really set the tractor up a bit. I bet it lifts it at least 4 inches.
I was looking at my manual last night and there are different sized rear sizes listed. I think it was 12.4-16 for R4s and 13.6-16 for turfs. The turfs I saw on the B2630 were 13.6-16.
I'm no tire expert - I'm just making observations.