Given the HP level on spray, I'm surprised the pistons didn't have all those machined corners blended & radiused before being coated.
There are no sharp edges on the Pistons, they did slightly radius them but they could have been a little more aggressive.
Here is a picture of the nitrous softening Bucks did to the chambers. (I have to go and touch them up because we had to surface them for a small scratch from when we machines the pads down for the T&D rockers.)
Is the "softening" that 'semi-hemi" cut on the opposite side from the spark plug? I have a set of B1s that have been milled to 47cc chamber and that "semi hemi" cut would go a long way to making the chambers larger.
Edit: I looked at my 47cc chamber heads and they have been surfaced all the way to the edge of the 2.44 intake valve seat. No room to "semi hemi" left.