The BGs are a bit overpowered for what they do and the NW associated.
My +16 named ones give +51% to my missile damage. That is about 1M a hit when I do my max hit. Which of course is rare.
But since people state missile damage it too much how about this:
For every + on the BG, it effects x1k on the weapon.
So my BG would effect x17000 of my ELB, the other x8k would not be subject to increased damage from BGs.
This, of course, would only effect super high x missile weapons.
I would not wish to see this change unless other things take place, such as fixing already broken counters.