Yeh mine can move around 10mm at the moment, so i'll have to reduce the gap.
I haven't accurately measured the pointing error because of lack of time out under the stars with it. I'll take more notice next time when I measure the TFOV of my eyepieces
My star alignment catalog is similar to yours it sounds, pretty limited. The Argo Navis we used on my scope at the SPSP was most excellent, you could choose to 2-object align on ANY object, stars, planets, DSOs. And the features and user-interface was far superior to the SC, but at $600 for just the AN computer it's a luxury for the future.