Hey Jørgen
I am working with some stuff about Kampfgruppe III./KG 53 and I suspect that the H-20 very well could have been from this unit. The units main task at this time was V-1 rocket launch missions in the night.
At this time they also had some unknown losses not accounted for during those dangerous missions. I will look further into it.
Greetings from Norway
Knut Larsson
www.rafandluftwaffe.info