Do you have a standard order of filters in your Mattebox?
I‘ve heard different „rules“ like ND first, then Diff, or vice versa, but when I did a bit of quick testing I couldn’t see any real difference in the image.
For convenience I like to have diffusion filters nearest to the lens, because these are usually the ones that stay in there for the whole day, and then have ND in front of that.
Do you have something else that works best for you? Or did anyone maybe find a difference in the image that changes with filter order?
I was trained to always keep the diffusion closest to the lens. Placing the diffusion further from the lens can, in theory, change the level of diffusion on the image. In practice I think it's difficult to see the difference, but I think it's important to have consistency.
Always keep multiple filters in trays stacked, not with an empty tray in-between. Gaps easily cause reflections.
I do something similar. Only when the DP uses a rota pola, I place this one always as close to the lens as possible. Infront of that I put it the ND filters and any special filters. What I tend to do when having those really special filters, is keep a tray "empty" in between so I can remove the empty tray and tilt the filter when there are unwanted reflections or such.
Have a nice day!