wait a minute, you are using a record 10 chain on a dura ace freewheel ? I suggest you try another chain, I recommend a Sachs PC-850. The record 10 chains are narrow and since you report skipping on the small cog, that's probably the greatest chain angle out of plane with the cogs.

Do you have a way to check chain wear ? The Rohloff chain tool is excellent. In the pic below, the chain indicates "worn".

Lastly, if your freewheel is indeel "wobbling", it's possible that the body is worn or (maybe) defective. Someone above recommended adjustment of the internal cone, that's a good idea. Dura Ace freewheels (the MF-7400) were among the best ever made. I do have a supply of spare bodies, contact me off list.

Mark Petry
Bainbridge Island, WA USA