I have re-set the Unit Spawner setting for each German unit in the battle from:
playerAndAI to playerAndAIOnlyOnce.

If playerAndAI setting was ticked it allowed multi spawns of units until the phase area was captured and then there were no further spawning.
So ticking playerAndAIOnlyOnce , This will have the effect of reducing re-spawns and the battle should run more accurately as per history.

I am currently going through my battle maps and making changes were required:
1) Omaha Beach landing - ver 5.0
2) Point Du Hoc ver - 3.0 – with beach landing
3) Pegasus Bridge ver - 1.0
4) Operation Sealion ( a what if battle)

Totally re-worked with more units and graphics, sadly FPS may be affected