I don't know but it looks like to me that the spray pattern is not hitting in the bowl of the piston? It looks to me that the piston wash is on the top of the piston, and could cause cylinder wash. I guess that you should see more in the bowl?
I don't know but just my thoughts out loud?
Snoxracer
Looks like another reason why honing out stock injector tips to flow more fuel is not always the best way to go.