Take a good look at just about any form of racing involving making turns, not many have super short sidewalls for good reason and those cars are on very smooth surfaces in most cases.
I guess that depend how you define "super short" - most of the bigger money tin tops are running 45 series, at most, and sports racers and junior formula cars are running even lower profiles. Take a look at the availability of competition tires in 17" and above (which are the sizes that modern race cars are running) - you're pretty hard pressed to find something as tall as a 45 series. LMP1 cars, which are specifically designed for reliable speed, run 35 series.
I think that we can all agree that:
Slightly stretched (wheel width == tread width rounded up to the nearest inch) will give better response
Square or under will give better ride
Less sidewall will give better response
More sidewall will give better ride
More tread will give more ultimate grip, regardless of stretch
The above is hugely dependent upon the tire that you mount
A smaller diameter wheel will allow for more sidewall at any given maximum tire diameter
A lighter wheel will help in all areas of performance and give a better ride than a heavier wheel of the same dimensions
We can all speculate that one wheel is stronger because it's heavier than other, that the roads that someone else drives on require a certain amount of wheel strength or sidewall give, that "my" wheel choice is the best choice for everyone, that "everyone" is scolding "me" for liking one wheel over another, that weight is either under or over valued in a wheel choice, but that's all speculation, opinion, and whining.
Me, I'll give up ride for response, to a point. I'm super happy with my wheel choice and, thus far, would recommend it for someone that wants out of his/her FiST that I want out of mine. I've lived in Western PA, home of the worst roads for many years running, for over two decades and have bent 1 medium-grade wheel while running 35 series rubber in a construction zone, so, either, I'm really good at dodging or am really lucky or both. I really like how the 205/40 B-stones are working on my new wheels. I *really* value the input of forum members that have actual experience with different setups for different purposes, especially those trying out new things and contributing their findings back to this community. And I really am uninterested in finger wagging and speculation with no factual backup; this is the Internet, after all, where everyone's option is fact..., in their world.
So run your 15" TD 1.2s or 6ULs with 255/50, or your 17" 6ULs or OZs with 215/40, or your 18" ET 30s on your bagged FiST. If you like it and it works for you, awesome. I've yet to see a set of wheels on a forum-FiST that looked worse than the OEM wheels (except maybe those 18" ET30..., not for me). And, more importantly, everyone who has posted a picture of their newly shod FiST did so because they were excited about their new wheels, and that's good enough for me.