Hi Jen
You can have it well polar aligned, but it may not guide as smoothly as you expect. Your sub exposure approach is the best way to go where you combine as many as you can get, particularly for an LX90, and it looks like you have started that.
Try getting as many exposures as long as possible when the sky allows (yes, weather has been a real problem here in SE Qld for the last year or so) and combine them, and be prepared to throw away those that aren't round.
The key is to build up as many good quality sub images as possible but only use the good ones. I know, it takes time, but it will be worth it. If they were taken on the Gold Coast, you will have the background affected by local light pollution. One way to improve this is to get up to Leyburn sometime for better quality skies.
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