I never intended my comments to come across as if I was talking to you as if you were stupid. I appoligise if that's how you saw them.
All I am saying is that an attenuator does reduce the signal, whether it's a fixed one or variable. There is no 2 ways about it. Look it up if you don't believe me.
As I said previously, in some circumstances the levels indicated on the box can be false if the feed levels are too high. They swamp the front end of the receiver & actually reduce the indicators on the box. I can actually do this with my Q5 box. I have a variable gain cable amplifier. If I gradually turn the amplification up, the Level & quality meters actually reduce untill they show zero because I have overloaded the receiver.
You can get the same effect when using high gain signal boosters on TV's.
I'm not saying with 100% certainty that this is so in your case, but the fact that you are using a variable attenuator to increase the meter readings on your box, indicates that this could be the case.
I know you said that you don't want to discuss it any more, but could you attach a photo or post a link to your attenuator.
Also does it require a power supply?
EDIT...whoops. I didn't see your edit until I had replied.