Pumping up the tires extra hard just for those canyon-carving sessions can mitigate or eliminate any loss of grip due to the sidewalls rolling over. And let's be honest, coming from a 195/60, you'd already have a lot of that happening anyway, unless you're already running high pressures!
When I get a test unit with ultra-tall tires, I often find myself sticking 45-50 psi in when I want to have some "fun"... Not a substitute for better tires, but at least the handling gets more predictable. Some police instructors have suggested 60 psi... but then they're running old-school balloon tires on two-ton ladder frame sedans, so...
Any loss of grip due to the narrower section width is either marginal or non-existent, depending on who you ask, and likely the tire compound itself will have a greater effect on lateral grip.
As said, though, the tires will be more likely to follow the road. They'll affect on-center stability on the highway and might feel a bit more tippy. Pump them up hard and the wandering is exacerbated, in most cases... but I don't know if this is dependent on the cars I've had these tires on, so YMMV.
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