General diesel engine timing questions...

[GOT-Torque]

Thinking in very general terms, what all affects the timing of a diesel engine? Are any of the following not true?

1)cylinder pressure
affected by:
-compression ratio (the higher the C.R., the more cylinder pressure you end up with and the more effective timing you have)
-boost (amount of air compressed into the cylinder)??? not sure on this one ???

2)fuel injection event
affected by:
-timing boxes (boxes cause the inj. pump to inject sooner)
-intake air temperature (read by the ECM and can cause the inj. pump to inject sooner or later) to compensate for the density of the air
-injector size (as the holes get bigger, more fuel reaches the cylinder sooner in the injection event, and the more timing you end up with)

In my quest for more power I have progressively gone larger and larger on injector sizes. With each step, the quantity of fuel delivered increases. Also, the effective timing of the engine increases as more fuel is delivered sooner in the injection event that the previous set of injectors.

Will a camshaft change affect the timing in any way? more air in the cylinders...

What options do I have for reducing engine timing besides reducing the compression ratio?