First stop wasting your strips, testing yourself with anything other than your first void of the day will not give you any sort of accurate picture as to whether you are clean or not. In addition don't try and interpret your THCA concentration based the strength of the line. A line is a line is a line.

You are correct that water and cranberry juice are useless. Sweating is useless as well and besides you don't want to be doing any fat burning exercise and releasing the THCA from your fat cells right before a test.

Yes, you are supposed to be resting and eating fatty foods 3 days before your test. Good luck.