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If I understand how you've set your guide camera up - its a short telescope / guide scope - held in a finder scope bracket with small 3 pins to lock it in place and maybe a web cam or guider camera at the back?
I personally wouldn't trust the finderscope bracket and its three small screws to be secure enough to hold all of this without differential flexure. Maybe try experimenting - carve a crade out of plywood or something firm - attach the guide scope to your mounting bar firmly with that and see if you guide better or worse. It may look crude - but for a few hours effort and a few dollars cost you can check where your bracket and its three screws are too flimsy to hold the guide scope securely enough.
Just guess work on my part, but long exposures demand absolutely no flexure meaning total rigidity and solid engineering of brackets and clamps in my experience.
Hope that helps, Matt
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