Engine cuts out and runs rough after heavy acceleration. Eml lights up and throws up high speed crank code.

Hi all on my 2002 Landrover td5 90
Having a really rough time trying to resolve this issue even giving in and sending it into a garage to resolve which they haven’t done although making me buy new (reconditioned) injectors
I’ve replaced the crank sensor numerous times, with oem and genuine ones no joy
I’ve also check the look of the crank sensor by running an overlay to the sensor itself, still nothing
Changed the ecu for one in a similar age disco td5 with the same ecu. Had garage reprogramme it to fit the defender and still no joy. Even now it throws up an ambient air pressure code on the nanocom and reads 80kpa whereas the original ecu which I had repaired by empire tuning shows a perfect aap pressure of around 100.
All my sensors are reading as they should such as maf
Changed the fpr and fuel pump
Put a decent starter motor on it in case it was giving a noisy signal
Tried putting the washer behind the crank sensor which didn’t seem to change the issue

I am now thinking I have a boosting issue as under high load, the turbo pressure is at 321 bar. Is that correct?

Any suggestions would be greatly appreciated