It also depends on what time of day you test yourself and your amount of activity. More active and it will release more thc into the urine stream. Early in the morning, first pee of the day is when your thc levels will be highest. You're still testing high evidently because the confirmation test doesn't lie. You may want to check into subbing with synthetic urine. Dillution might work but its never a sure thing.
A line is a line. They vary in intensity.
The drug testing facility will not release any information about your drug test. They only release that to the people that are paying for it. Drug test results can not be released to anyone else unless you sign an agreement to release that info. All medical info is confidential and either requires your signature to release or a court order.