DBK is really good coin. Hard to mine, daemon blockchain sync good and fast, no error. Diamondback have a good pool support (Extremepool). Payment good and fast.
I think no reason that's DBK still no exchange now.
Agree with you except one thing : diff it TOO HIGH for network hash rate. Neither dev or pool owner do nothing about that.
This is a difficult one

Seriously though, any adjustment or tweeking will quickly be undone by Network hash Increase. I have been in discussion and am trying to get Diamondback onto more pools. this will immediatly level the playing feild.