I'm still happy to question it. We are a boat of extremes, sometimes we can sail to 880 given a very favourable course, a very favourable constant windspeed and no wind shadows, no close tacking, no shallows blah blah.
Given unfavourable all of those sometimes I reckon I sail nearer to 990; however of course noone lets me sail off that.
Nearly all boats have their favourable conditions and can be a bandit on their day, its just that the swing is less [perhaps except for cats]. My understanding of the handicap system is that its supposed to represent a mean, with the ability for local variations to take place. If 880 is that then it would imply that on a good day we can sail faster than that, well only if its a drag race on a perfectly set reach in flat water for 6 miles, has QM changed shape since I last went ?