Ambient has become such a wide concept nowadays... But the importance of space (by means of depth and panning) seems to remain quite constant. So, if this can help, two remarks:
Beyond uBurst/Clouds and some Disting algorithms (Btw I do approve Defragmenteur), it seems to lack of reverb/delay, or some more sophisticated fx here. Do you plan to use any pedals (blueSky, Afterneath, etc.) or other external fx?
How do you mix? External gear? Software? So about panning: same questions... But a little stereo mixer inside the rack (I personally use a Doepfer A-138s including for control signals) could be a convenient submixer in any way.
'On ne devrait jamais quitter Montauban' (Fernand Naudin).