Yep, I think you should leave well enough alone, as long as you're getting good arrow flight. Heavier FOC will always make arrow flight with broadheads more stable. 2% might not be much, but sometimes it don't take much to be noticeable.

It's hard to fault a product for doing what it's supposed to do, and those bleeders are supposed to break off if they hit bone. That way they don't impede penetration. But they do stay inside the body cavity and can give you a nasty suprize while field dressing or processing the meat. I learned with the old Bear Razorheads that I didn't want to use those razorblade bleeders any more, and the Magnus bleeders are very similar. But that's my personal preference. If I felt like I needed bleeders, I'd get Zwickeys with the bleeders that are formed directly from the ferrule.