To answer your question. Yes you do need to recalibrate the guide camera every time you move the OAG to find a star. - What software are you using? I use an OAG on my C8 with the 120mm through the ASIair plus and it takes 60-90sec to recalibrate.
To make a physical item more solid? I gather that’s just the quality of the product. Have a look at the Celestron OAG
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