I went back and restacked them for about the 50th time. This time I went back to blinking them and took out another 17 frames leaving me with 42. I thought I was being fairly ruthless already. The 17 I took out were just a slightly lighter shade of grey than then rest of them.
Anyway it made a pretty big difference. Either that or I repeatedly made the same mistake with one of the pre processing settings about 50 times in a row
Here is the latest version of it. Colour is probably a bit over the top as is usual for me
I definitely need a lot more data for this target but at least I know I can actually process it when I get it now. Only 3.5 hours in this one, I think I would like about 35 hours.