I glued some fillers in my stock ones made of cutting board. just small enough where they dont touch under normal driving but when pushed there right there to stop the movement. kind of a pain to get it right, but work fantastic and it only cost me $5
For a street application, the lower durometer ones will work fine. I've had a set of the lowest ones for about 3 years now and can't say enough good stuff about them. They will be stiff at first and make you wonder if you made the right choice, but once they wear some you should see some of the extra vibration go away.