You will never get the 748 to steer like a gixxer mate, they are chalk and cheese. You have to use good old muscle to ride a duke fast, I'm sure most will agree but we've all got used to it now so don't realise we're doing it! The trade off though is a rock solid surefootedness in faster bends that the gixxers simply don't have.
That said, you can improve things dramatically turn in wise by getting the chassis set up to suit. I wouldn't recommend doing this yourself if you don't know how but go see a specialist. Don't know where you live but Baines are a good bet, as is Sigma and maybe AJR.
The difference a good set up makes cannot be overstated, and the beauty of the R is that the suspension adjustment actually works (unlike gixxers)
Failing that, if you live anywhere near one of us on the board we may be able to help
