I know this is made in Germany. It's always more of a challenge to deal with instructions that were translated into English by a person for whom it is a second language. It's not a lot of fun to get tech help in the same situation, either.
It was very good of you to take the time to type out exactly what the instructions said. I haven't seen the instructions since we bought one last year. Knowing my husband they could be anywhere, including a landfill!
I think we did have a little confusion over the more light sensitive vs less light sensitive terminology. I agree with you that they are telling you to turn it clockwise to have it open and close when it is darker. It would logically follow that you would need to turn it counter-clockwise, to have it open and close when it is lighter. I can understand your frustration at the screw not being able to be turned counter-clockwise.
What I remember from last year, is my husband complaining about the instructions and then experimenting with the setting. I can't give you any other information until later tonight, after I talk to him.
We haven't had any losses from using ours, but I'm sure we have a lot of contributing factors to each of our situations. Is ours opening and closing at a different time from yours? I don't know. Was our adjustment screw in a different position from yours when we got it? I don't know. Since we bought them at least a year apart, was there some difference in the way they were manufactured? I don't know. I know this is not helping you, at this exact moment in time. I will certainly get some feedback from my husband when I can and also think about this some more. I'm hoping others that are using this door will chime in on this. I know what you mean about not wanting to have to constantly adjust a timer. That was why we didn't go with a timer.
If you want to obscure the sensitivity of the light sensor, I would be inclined to try something like a gauzy material or a tinted light filter, that could just be placed over it, rather than painting on it.
I just thought of something else. We have the model with a probe, so it could be installed indoors. Is that what you have? I don't know if that makes a difference.
I'm very glad you came to BYC, even though it's under such terrible circumstances.