There are a few other things here:
You are correct with the shortened INS - the map itself doesn’t appear until the proper INS timing (you can set to NAV and start flying once the OK is up) is completed - when the short INS time was patched in, there was a report that the map still took the old longer time to show up and I don’t think that was fixed or changed.
The map also is not available at all zoom levels for all sections of each map, so try adjusting the range scale to get the map to display. There is more map sections for Caucasus than the Persian Gulf.
As for waypoints not being correct, that sounds like the INS switch wasn’t set to NAV or INS align wasn’t complete. You can also just do a baro altitude hold and fly level and straight - set INS to IFA for a couple minutes then back to NAV, just in case.