The D3 is designed more for more work-ability.  If you are hooking and slicing the ball instead of drawing or fading the ball, you might be over swinging.   I went from the D3 to the D2 and went to a fade then to a hook.  Opened the face .5* and now am hitting with a slight cut.  Had to choose between a draw or a cut with my D2.  If I over-swing my old D3 or my new D2 I can produce a huge hook.  I try to swing at 80 percent if I can.  That is just me.  But by opening the face I can hit it a little harder with less damage. You get in less trouble with a slight cut.    

Lets assume your driver is a RH D2 9.50 and you have increased the loft to 10.25 or +.75 which would be a D4 setting.  If you wanted to increase the draw on the face you would set it at C3 and if that was not enough then you could set it at D3.......I hope this makes sense and it might resolve you problem unless you have an alignment problem and I would suggest you see a teaching pro.....D3s do have more workability to them.....even with mine set at C4 .05 open I can still draw the ball and if I swing too hard I can really hook it.......hard swing bad alignment....good luck with your adjustment tool and remember one click.......cz 

"I can't blame a driver for a bad swing"

although we'd all like too! Good luck!