Finally a wheel brand I've not heard of! They look good. Weight is also pretty good.
I have a theory, one that some road racers have fleshed out in practice, and some car manufacturers have figured out too. I believe that sidewall "feel" changes with the wheel WIDTH, along with the tire's dimensions (ratio) and of course the tire itself. I've learned over time that a wider wheel with the same tire will result in a more firm sidewall feel. Porsche seems to have this same logic applied, too. For instance, if you were rocking a 9.5" or 10" wide wheel on that 275, I bet it would feel less squirmy. In a trapezoid shape, the shorter top is more stable. So that's something to think about when doing wheels and tires. I personally strive for the widest wheels that will fit, and then find the right tire for that. This not only makes for a nice wide stance with a good looking flush fit, it also improves the handling.
Maybe something to consider next time you are making a wheel setup plan. Just try for wide wheel first, and try to push that limit. THEN try your tire and see what happens.
