From what I've heard the Blackhawk isn't very forgiving; I guess it was designed more for flat out speed.
I think you have the Blackhawk and the BlackKnight mixed up.The BlackKnight has a brace height of 5 3/4 with an IBO speed of 342-350.
The blackhawk has a brace height of 8" an an IBO of 309-317.
Congrats on the (new) bow bigbuck90------and on the better shooting and scores.Looks like the Hoyt seems to fit you a little better.
Personally I cant see where the Blackhawk isnt a good shooter with such a forgiving brace.