The best advice I can give you is this: Trial and error!
Just try... Set all sliders relatively high, and if your frame rates are too low, set them lower.
Matijs Kok from another company compiled a nice document on selecting the right settings etc a couple of months ago, not specific to any aircraft or scenery. You should be able to find it on their forums.
(Sorry for the reference to competition CS, but it's the best advice I can think of)