So light didn't resolve issue, that's the bad news...
Good news, I raised a support ticket with pimax.
In less than 24 hours I received two emails, first was pointing me to piplay 1.42.1 this has been great for controller tracking but headset was still intermittently not moving with my head, the second was four files one already existed but should be overwritten in the runtime directory the other three appear to be new.
Tracking has been flawless since I did this, happy to share the email if anyone interested.