Are sure that pempro isn't reporting 600 arc seconds? 600 arc mins is huge, 600 arc seconds isn't small either and you can't be that far off if your sub looks like that after 5 mins. I'd say it has to be a setting you have wrong somewhere.
My mount is permanently set up outside and the slab I have it on moves all the time so I realign every full moon using pem pro. I align to about 30 arc seconds each axis. Pem pro has been the most hassle free consistent polar alignment method I've used, and I'm pretty sure I own or have tried them all.
One mistake I made early on was I was using my guider to measure PA rather than the main scope.
Thanks
Sandy
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