I used a silicon paste grease.When you install these bushings, are you using a high quality synthetic or high temp grease on the contact surface? Or even at least something like some white lithium grease? Because if you are not, you can 100% expect to see early failures in that type of bushing 100% of the time regardless of the quality of the part. They NEED to be greased, and looking at your pics I'd have a very hard time believing they ever were.
The pic was of the old bushing, and before I greased the new one. Didn't want my greasy fingers on the phone.