Hi,
If you’re sending to a stereo FX channel then you can also pan the send signal - the Panning tab at the bottom of the Sends panel on the Track Editor. Then in the Track Editor of the FX channel itself you can also change the routing of the insert FX, click the Routing tab at the bottom of the Inserts panel. That should do all you need I think. By default it’s all panned centered.
Mike.