additional:
Elevator +/- 7mm, no Expo
Rudder: as much as reasonably possible
Aileron: up as much as reasonably possible, down 50% of it
Crow/"butterfly":
Flaps: since the flaps are very slim, you should achieve a deflection of min. 60° (deg.) down! For this achieved:
Aileron: 7mm up
Elevator: 1,5mm down
Like this the 600 will fly down the final approach really fine with a pleasant rate of descent.
Since all of the control surfaces are scale and not extremely effective I use no Expo or Dual Rate at all (this way my only glider model of many).
Bertram