A little late getting the report back... but essentially I ran with the K-37 for a couple of months. At the end I could see no noticeable improvement in clarity. There may be other variables in my system that weren't being factored, but that's how it was for me. Hope this helps.
I need to catch up on the other threads, but for now my plan is to add a distribution box, jet my lines, then shock the system with oxygen (forget the additive of choice).