Cheers Glen.
I'm getting snookered many "clear" nights by dew that turns into fog, like right now... To be fair clear outside said it would.
I used Subframe Selector in pixinsight. I relaxed the cull on eccentricity and shouldn't have evidently.
I built it myself. They're lego. I prefer Gigabyte Ultra Durable Motherboards, I've "stress" tested them in the most horrid conditions and they've all just taken it. Just upgraded the CPU to a 16 core (sweet!) and 64G Ram @ 3200Mhz. The system drive is a NVME M2 SSD - best thing you can put in a pc to make it feel fast(er). And an RTX2060 gfx card. I usually copy the current project to the SSD to crunch it and move it back when done. After upgrading I added 4 swap directories on the SSD for pixinsight and ran the benchmark - no overclock just memory boost - and got 26th. Pretty happy
Umart are pretty good for parts.