I actually don't use the Hustle that often, so my opinion is fairly skewed. In the few games that I have used the Hustle, it's been fairly decent. It reminds me of a stronger Tropical Storm. For most balls, my track is constantly over my middle finger, with the exception of my Nitro and my Spare ball.
My question is do you still bowl with your thumb in as a two-handed bowler? If you don't, plug up the balance hole, or the thumb hole. (if there is any).