Without running your set up it would be hard to know for sure. My bet would be that unless you were shooting really underspined to begin with you will be fine. Most people shoot carbons on the stiff side, so one inch shouldn't make a huge difference, might make them better if they were too stiff.

The only way to know is to tune the bow. You will know for sure when you put some broad heads on and shoot them. You may need to re-tune your bow, then again you may not.

Paul