Can u do me a favour Chris and try Protrack and say a 10 min unguided photo at F5 with the FSQ ?
Just redid my PE as well about 4 peak to peak so i'm stacked as well.
Also if u use the
right cable for ST4 u can guide well too

Here's a 20 min guided photo of M47 as a test, it's a largish image so u can see the nice round stars, hehe.
Thanks all for the help