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Try cranking up RA aggressiveness and hysteresis. The only time I've ever seen a really low OSC is when my graph almost flatlined and my guiding was quite crap as a result.
The other thing which has caused it for me before was having a really well balanced telescope mount. I used to think the closer to perfect the better but apparently you want the mount to be heavy on one side to help with backlash. At the time my guiding was just fine until my scope crossed the meridian and then it turned really poor.
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