@ScotRod had a quick viewing session this evening. Work in the morning. Allowed scope to cool for an hour and half. Checked out jupiter and x4 moons initially with a 20mm, looked nice, could see bands but not the greatest view. Switched to 9mm redline, looked OK, in and out of focus, shimmering style effect on it. Made it hard to pick out details, sometimes to the point where it looked like a fuzzy white blob for a few seconds but also could see banding at times. I believe this is bad seeing due to turbulence in the air. Switched to stock 9mm and same effect, slightly worse image but not that bad in comparison to the redline 9mm I own, just a more difficult to use eye piece with a smaller view.
I don't recall jupiter being like that the first couple of times I used the scope as it was a lot more stable image. However, Jupiter is now currently above a neighbours house which I'd imagine doesn't help the image due to rising heat.
Switched over to the moon since it'd appeared behind me, views fantastic in the 2inch stock 30mm. Tried 20mm redline, the same. Switched to redline 9mm and view was still crisp but slightly shimmering on the edges of the moon, switched to stock 9mm and very similar performance to the redline with the shimmering in the edges, again just didn't feel as comfortable to use and smaller view.
Is it possible that you're just having bad seeing? Just my guess.
Can't comment on your defocus star test issues and I'm an inexperienced telescope user so I'm sure others would be able to help a lot more with that.
Hopefully you get it sorted