XRAY - Model racing cars

I'm in need of some answers guys,

I've bought the Hudy set-up system ( #108805 ) for off-road cars.
Got it today and got to work on setting up my TQ, But when i tried
to adjust the camber ( I read the manual and removed the anti roll bars pushed on the chassis to get the shocks in postion ) the values change every
time i push on the chassis, same goes foor the steering set up, when i try it
whit the transmitter on the initial values seem to change. how can that be? is it because i do something wrong? Are ther any of you out there that have the same problem ? Anyone experienced the same problem?
Please let me know if i'm doing something wrong.
Appreciate your replies.

Thnx,
Eelco

i always have a bare wheel to rest the chassis on so you have a datum point to which to check readings in the same place every time