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I had a focuser made by the same company as your Sharpstar- the compression rings on the focuser are awful and need to be replaced. They do NOT hold anything properly, and this will account for the "slump". The 2" insert is also a sloppy fit.
The focuser itself is OK, but you'd be best served replacing it with another option if you want to get into imaging seriously. I managed to tune mine, but it still was so-so at best.
Your spacing also seems off, and using a reducer not specifically designed for the scope will mean you will need to fiddle to get it right.
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