As you know, in calculating a new chart, the db you use for the Find button only has time zone information after a certain date (I think you said it was 1980). Before that, we have to add time zone info manually.
One place where I've made several mistakes (and had to go back and correct them) is for correct time zone direction for eastern longitude locations. I just forget to click East on the TZ Corr field (until I see the chart is wrong and go back and fix it). How about this tweak (after the processes triggered by Find) for places where the db can't provide time zone info:
- If geographic longitude is East
- AND Time Zone is blank
- THEN leave TZ Corr fields blank but set the toggle to East instead of West