712 CB Shaft Change? Help!

Hey there, I have a 4-pw set of 712 CB irons that were built with KBS tour S. I am installing DG X100 tour issue shafts. I know these are 10g heavier, so my question is; do I use the shaft inserts from the KBS shafts or do I install these without any insert? I should of probably set these in to Titleist, but I already bought the shafts, and sending those to titleist is not an option, as they insist on using there shafts. Any help or insight will be appreciated. Thanks Steve