I'll have to put the final 'magic' setup up in the setups thread, it's almost as the Bury setup but with a few tweaks here and there that make it more consistent.
You also said you only had 3 washers under the rear camber link, try to get some longer Losi Ti ballstuds and get 4 under there, it makes a
big difference!
Don't be scared of the one-way diff, if you have a go with either Lee's or my cars you will be amazed how consistent and balanced they are
Are you going to the indoor finals? If you are and still having trouble by then throw the car on my table on Sat and I'll give it a going over for the Sunday
:::EDIT::: - I've just had a look back at the Bury setup, copy it
exactly but goto the outside hole on the front wishbone and medium wheelbase
Run the rear as wishbones level and the front slightly lower.