Hi Paul,
How long are the guiding integrations? Try to keep them around 0.5 to 1 sec for testing.
Are you saying with PEC off, going from aggr 3 to 8 does nothing? Try going from aggr 0 to 5 (with PEC off to keep things simple). You should see _some_ improvement. Otherwise I would question if the guider signal is actually getting through. You do get an L shape when calibrating?
Try turning simultaneous corrections off (advanced guider settings), just in case, but I don't think it's that.
Best,
EB
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