[AstralTraveller (David)]

You've been quiet for a while; nice to hear from you again . It sounds as though you need to speak to the owl about a freezer suit. I went for the jacket only and boots. [I use heavy corderay pants with two-layer track pants over them.]

Sorry but I've forgotten what 'scope you have and I don't know what eyepiece you are using. I also don't know how you have collimated. Are you disappointed with the view or do you just wonder whether it could be better? Jupiter isn't a great test of collimation. Centre a bright star at about 200x and rack it out of focus until you can see the Airy disc. The disc and ring should look nice and symmetrical.

If collimation is OK there are other things that can degrade images: tube currents (mirror not cool), stray light and internal reflections are three common ones.