Excellent
Under expose - Yes I do that anyway it I baffling how much detail you can recover post isn't it, no chance with heavy highlights though.
Flash a full power - awesome, I think i'll pop a transparent bag on it too as mine are cheapy Yongnuo units. I'll just play with the distance behind the subject my units are not as powerful as your SB900s.
Rear curtain sync - will do.
Now, just for the rain - shouldn't be long here in the UK :Cool:
Many thanks :encouragement: