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Longer focal lengths may show more up and downs in PHD. You've been using a very short focal length scope so the bumps up and down with the pE would be a smaller angular distance than a 1600mm focal length.
Your attached image shows round stars so there is no problem. The elongated stars at the lower part of the image are tilt issues not guiding. I have made that mistake before, trying to correct guiding when it was tilt.
Your CCD Inspector graph shows heavy tilt so I would try to pack out the offending side (probably the top of your camera looking at it from behind the scope).
Greg.
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