Thanks for the tip with AutoHotkey, I'll give that a try.
You might be right about the setting related to control lag. The label is 'Stick Force Simulation' and I thought this refered to the amount of force feedback employed. Since my joystick is tilted to try and emulate the astir configuration the joystick motors can't centre the stick unassisted so I must have increased this setting as part of the trial and error process, not realising it was for a completely different purpose and has probably been causing the control problems all along.
Anyone tried the Wrap 1200 VR visor http://www.vuzix.com/consumer/products_wrap_1200vr.html
Looks like it might be an interesting alternatvie to a large screen display and head tracking.