Maybe remove the standard nose piece, and have a new one made up that is open, but threaded for a 2" filter. Grab yourself a Baader U filter and screw that on, using a little bit of sealant grease on the thread to ensure its sealed.. That reflection is a direct result of the rather low quality anti reflecting filter in the standard nose piece..
If you have freezing issues even after sealing it up with a 2" filter, you could open the camera up and find somewhere to tape in a big sillica gel satchel... That would suck the moisture out of the camera once sealed up, and keep the nasty ice off the chip... I also found with my QHY8 that regular (once a month) cleaning with 99% Isopropyl alcohol greatly reduced any icing issues..
I'll post back when I've got more time to go over other things I thought of when I had my QHY8... Off to work for now
