they all wobble a bit. TD have aparently just release some new diff washers (TD709001) which are a bit thicker than the previous ones, thereby reducing the wobble a tad.
The new washers are silver, the old ones black... same part number.
If you want to know how to get the pesky outdrive out of the diff casing I have a natty trick - get a wine bottle, put it outdrive down into the wine bottle, then using a hex driver and a heavy thing, firmly tap on the outdrive end that you can see in the diff case. You will bend the e-clip and the washer in the process, but it's quick and reliable & nothing else gets damaged.
You also get an excuse to drink the wine too.