What kind of grease are you using?
Also, you have put to much on. MB recommends only a light coating of their own special grease.
Do not use anything else. I researched this for some time and the MB grease is the best.
The manual is pretty specific on this as well.
You might try Fastlane and see if they will send you a small film canister full for about 3 to 5 dollars. MB sells it but in a big tub for $50. That's about 25 lifetimes worth.