HE111P G1+DT

[Passo Stanco]

Dear all,
I need your help
I'm serching any information about the HE111P Wehrke Nummer 2822 G1+DT fallen in the St. George Channel, near St David's Head, Pembrokenshire, Wales on 29th september 1940.
The crew is formed :

Pilot: Oberleutnant Hans Kohler (MIA in the sea)
Observer (?): Feldwebel Horst Birkholz (born 6 september 1916 Posen, buried at Glencree (Ireland) grave 7)
Funker (?): Uffiziere Rudolf Adolf Firchau (born 13 july 1915 Tuchel, buried at Glencree (Ireland) grave 20)
Motorist (?): Felwebel Martin Lippert (MIA in the sea)
Gunner (?): Gefreiter Franz Gunther (born 24 august 1918 St. Bernard, buried at Glencree (Ireland) grave 31)

the HE is from III/KG55 Greif but I don't know the gruppe: the 8 or 9?
the informations are confused.
I would like to know also if is possiblo to know more about the crew in particular about Oberleutnant Hans Kohler and if is possible to know who have shot down this HE111.
Also I would like to know if is possible to presume the colors of this G1+DT.