Some great info and input Alex
It was the opinion of both my observing buddy and I that the clearly excellent transparency up at Eaglview, was probably contributing to our colour perception. Your point about eyepiece and exit pupil resonates too because on reflection (pardon the pun) our perception of colour has not been the same with every eyepiece and we were putting it down to FOV
Eagleview is a great location to observe, you should come visit
Mike