Every room has different acoustic properties. What you describe, as best I understand, is a complete disaster. Forgive. Not trying to harsh on you!
When you activate the subwoofer level adjust, it overrides the Audyssey calibration. If Aud had your sub calibrated at -7, you effectively doubled the signal being set to the sub 3x over! (Just an example since we don’t know.)
That BIC has serviced your sub is amazing. Other companies would void your warranty! Which, frankly, it seems you actively chose to do.
My guess, as has been touched on, is that your Sub is in a bad location in your room. Acoustically, it is a null. You need to do several things to help yourself.
First, how big is your room? Total volume of open space! This is important.
Second, a pb 1000, though a good Sub, might not be right for your room. (See question 1.)
You should try finding a good home for your Sub by using the subwoofer crawl.
Then, run Audyssey.
If your sub needs to be tweaked, use only the Sub Level Trim, and do not override Audyssey using Subwoofer Level Adjust...
...until you learn and understand what you are doing.
Regardless of all that I just said:
Answer the question I posed about your room size. If you are trying to fill a large space with an underpowered Sub, you will be caught in a cycle of Wash, Rinse, Repeat until some smart CS rep or Repair Tech voids your warranty!
That will get expensive real fast.
Just a simple truth.
Best,
R