But when you produce the plogs on the day of dispatch the circles on the map are always 0 wind, otherwise you would have very wobbly circles!
So therefore your circles are your gross error check.
It could well be that on the day your time from say ETP2 to ERA is 2.11 on a 120 minute ETOPS approval but you are fully legit as if it were 0 winds you would be <120 minutes - or the other way round; ETP1 to ERA is 01.58 on the day but can be illegal as with 0 winds you are >120 minutes (or whatever your approval is 90,120,138,180 etc). But hey, that is what the circles are there fore - they would have been created during the planning/route analysis stage, so there fore on the day of dispatch you should not have to run a still air plog.
As a seperate issue, you guys have ITT and AMT (both) on your plogs?