Just to be the devils advocate, I'll point out a couple pitfalls of lefthanders.
Oncoming cars, when slightly out of control, tend to go wide on corners. That puts them squarely in your path on a lefthander. On mountain roads, that will frequently leave your only out a sheer drop down the mountainside. on a right hand corner, if you cut in hard and go off road, it'll usually be into a ditch or trees. That , to me, is a better alternative to falling off a mountain or colliding with 2 tons of out of control steel.
If you lowside on a right, the approching traffic will likely be going wide and give you more room to slide and probably avoid crashing into an oncoming vehicle.
Taking both points of view into consideration, I think it would be wise to never exceed 80% on the street PERIOD. On a race track the odds of colliding with oncoming traffic or falling off the mountain are pretty damned slim so going at 100% is fine. In the real world, there's just too many variables and they're all tryin' ta kill ya. Most death and serious injury on bikes are not a result of the initial bike crash but the impact with whatever object they collide with which is usually a car.
Whether it's the fault of the cager (it usually is) or not, they should be given a wide berth. If you're riding at full tilt, you will be in their less than perfect path. Ride how ever it takes to avoid cars. Just because you are skilled, confident, and in total control of your vehicle, you can't for even one second assume anyone else on the road is anything more than a blithering, brain dead, idiot.