If you have a specific request, there are some web based user forums on the net where contributors are much more able to provide information than I am. AVSforums is one of them, for example.
In general, you can try to get the timing parameters for PC software, the same value can generally be used on the Mac.
You can also try by yourself, but it's not easy to find the correct parameters. Try to use the values from the simplified settings that SwitchResX provides, and try to change them slightly to adapt the result. But it can be long and difficult to get working value.