I understand your thinking behind the adjustments you make to selected export windows. I was wondering if it would be possible, when WW wants to make the window shorter, to remove a part in the cheapest slot. For example, if I export from 17:00-19:00 and WW makes a 19 minute adjustment it just curtails the export at 18:41 - but very often 18:30-19:00 is the highest price paid during that period, or at the very least not the cheapest.
Could you look at the export prices and split the export in two, so that the removed part is in the lowest paying half hour?