In reply to davy_boy:
To be honest I've not skied them without. I went from Marker Dukes which had almost 0 delta angle to Dynafits. But the reason I got them shimmed is through talking to a friend and through reading online.
I've got the smaller screws too so might experiment next weekend when I'm out in Cham with and without the shims. To be honest though, I'm not expecting a huge increase/decrease in the control and feel but we'll see.