Will do. Information was from Matt @ Tyga as I use his chambers. He recommended between 100 and 125mm from the edge of the piston and set his to in the middle - 112mm. The Koso guide specified a similar distance.

I think that going wildly away from these will result in quite different reading with pressure waves, etc, but I am no expert.

On the subject of jetting, I thought that I may have too large a main as it is larger than the norm. I know that we cannot talk sizes, but it is in the region of 200. However the EGT temp suggests that it is bang on.