Timing determines height. Perfect timing can lead to flat sixes or "out of the stadium" hits; poor timing results in mistimed lobs that get caught on the boundary.
The (and later versions like Gameplay Patch v6.0) introduces: ea cricket 07 stroke variation patch top
Advanced users can manually edit .saf and .xml files (like shot15.saf for straight drives) to further refine trajectory and deviation. Timing determines height