Here are two methods:
1. Simply place some tape on your deflector which is possbly causing your dents, (unless extracting is so violent it's whanging against the back of the ejection port, in which case, see #2
2. Potty train that puppy. This is done by removing the "ejector" (not to be confused w/ the extractor) and ejector spring and "CAREFULLY" clip no more than two rounds OFF the ejector spring (note: small dikes are necessary for this as it needs to be a clean cut and ya don't want to be un-necessarily bending of the sprng itself) This will change ejection pattern and reduce the velocity of the exiting brass. BTW, HP shooters do this all the time to get their rifles to drop their brass in small consistent piles for easy pick-up, hence the term "potty-training".
Hope this helps,
Mike