Speedmaster spark plug holes improvement??

That spark plug hole depth is atrocious. Can you get an extended tip plug so that the threads finish at the chamber wall and the tip is actually in the chamber? Otherwise you will be starting the flame kernel in the boundary layer so its gonna be slow to develop and need lost of ignition lead and most likely you will need to run it really rich to get it to start not to mention the fact it's surrounded buy metal which as the flame gets underway will stop its expansion.

You need to fix that quick.