Being new to road bikes (but quite enjoying my recently acquired Giant Defy carbon) I'm finding adapting to the drop bars and subsequent riding position interesting. I spend most of my time on the hoods or "sitting up" holding the horizontal section of the bars (when I'm not in imminent need of lunging for the brakes or shifting) and while the aerodynamic difference _is_ noticeable when slipping down to the drops, I feel far less controllable there and my back doesn't love it. Even using the hoods "properly" (i.e. bent elbows... low position) is less than supremely comfy, and I was thus wondering....
Is it sacrilegous or indeed demonstrably biomechanically bad to tilt one's bars back/up a bit??

Cheers,
Chris