Fortunatley, the "problem" you're describing isn't really a problem. If I were you, I'd buy Loctite 242 removable strength Threadlocker. Use one drop one the male threads (go sparingly to moderate and take care not to make a mess), set the tension and let it sit over night.
As far as the tension goes, I like to get it as loose as possible WITHOUT ANY blade play. Open your knife, hold back the liner lock, and wiggle the blade side to side. Try to set the tension so your just at the threshold. Blade play is bad.
I had to do this with my CQC7A and Commander the first day I got them. One other quick note: Is your knife broken in yet? I don't mean the lock, I mean the action (washers). If is isn't, you'll have to so it twice. After the first "setup", the action will become smoother and loosen up. After a week or so of opening, you can set the tension for good.
Good luck,
Terry.