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The eyepiece/telescope combination determine the flatness of the field and I would say your eyepiece is contributing some significant field curvature.
As far as vibration goes; yes you will notice it more at high power but I would have thought and expected your telescope to settle within 2-3 seconds preferably less than 2 and any longer is annoying. You can get anti-vibration pads for the tripod feet but having never used them I'm not sure of their effectiveness. Note any strong breeze and your telescope will oscillate.
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