You'll need to purchase field point that are the correct size for the arrow or you'll have difficulty pulling them out of targets and could loose inserts depending on how well they were installed.

Many of the real small carbons have rings to be installed with the broadheads to give them a smoother profile.

What carbon arrows have your purchased?

I assumed you retuned your bow to the small diameter carbons because it will be off from shooting larger diameter aluminums?