Seriously at my wits end now...........

Batterys virtually brand new, heavy duty bosch one, i believe silver top.
 
I logged a few blocks on with vag com ... i think it was the injector duty cycle or something
The injectors will be maxing out or there abouts under load as the pump will not deliver the flow needed so they will try and compensate sp* by staying open longer.
 
I might even give this a go with my own car,but im hooking up a fuel pressure gauge and placing on the front screen and going for a drive...