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If it's PE, you should be able to correct for almost all of it using PE correction. I typically run 3 - 5 PE training runs on my LX200 classic, and after that PE is almost not noticable at about 2 arc seconds of drift (about 2 pixels in my camera). That's considered very good, getting it to that level.
If the error is in RA then there's a good chance it's PE. Polar alignment can account for some drift in RA also but that would be constant. I wouldn't expect flexure to have much impact over the short durations you'd typically use for testing drift alignment ( 5 - 10 minute increments ), I've always found flexure is only a problem over long periods of time/movement.
Try some PE training runs and see if you can improve it.
Ultimately with the focal length of LX200's you need to autoguide, I have found, even with 2 arc seconds of PE.
Roger.
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