As usual thanks Nick, that is the distincion I was looking for - I was aware of out of trim probs but wasnt sure about sideways flight against out of trim.
Tried the tight circling option the other day but photographer was slow with each shot and ended up puking down the side of the aircraft - not surprised as he is focussing on a single spot down while his body is going round in circles.
Will try less steep and at a slower speed and see if that works - Thanks.