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I've had the same thing in the past too, and the 15 degrees = 1 hour always make me check time and daylight savings switch - that caught me at least 3 times.
Also I time starts from the moment you start the alignment process - so it you started set-up - entered date but waited 30 minutes before you entered time all your alignments would be screwy.
Also I always try to do my 3 star align as fast as I can - well under 10 minutes if I can. I once completed a 3 star align over a 4 hour period - gotos where completely off. This was just to prove to me the clock doesn't completely adjust / update correctly between choosing stars.
On a pier once polar aligned what I ended up doing was a 1 star align to avoid time drag issues in the alignment. Then all I did was add stars at my leisure. Go to some star - then press align - replace alignment or calibration stars, centre it and lock it in.
This way always worked best. Then I'd finish my observing with a park at a home position and use hibernate. All I'd have to do from wake-up routine was select change on power-up and re-set time and date as accurately (and quickly < 20 secs) as I could then press enter.
This consistently produced great goto results for me.
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