Surely if you can do that speed in the fast corner then you are able to benefit from the reduced downforce? How is a corner at 100mph different from a straight at 100mph? A gust of wind in either case would have the same effect?
Sounds from your description more like gusts of winds could be a problem in themselves, forget corners/straights.
Well there are some corners that are flat with the drs open but most are downforce-limited, that's why the downforce setting is a compromise.
The wind is a problem in F1, drivers and commentators are always talking about how it affects the cars - braking distances especially.
It's a bit of a mystery to me how they get passive DRS set up to work reliably at all, but gusts of wind do look like a showstopper when airspeed is the switch.
Dunno though. It's obviously difficult, but they're trying hard. Maybe they have something 'passive' which alters its behaviour under lateral g.