Timing Issues- Rb26

[Bankrupt]

I've got an r32 gtr that has recently developed an issue.

It currently runs a power fc, HKS twin spark and splitfire coils, 600cc injectors and 2860-7 turbines.

I did the timing on it not long ago and marked the belt before removal. When i went to install the belt again I timed it according to specs and noticed that the intake cam was 3 teeth out from my mark. I re-checked my timing and found that I was correct and the cam was retarded by 3 teeth before.

Now the car doesn't make boost till very late and the power fc is making the engine check light flash when it comes on boost. I think this is due to engine knock, but I never really monitored it before hand to compare it to how the graph is now, and I'm not the best with power fc's.

Is it possibly a trick somebody has tried to do to set the car up to perform better at high rpm before it was tuned? Or are there some sort of aftermarket cams that recommend to do this? Im confused!

Here is the knock level when the light is flashing