Good write-up man! Five thumbs up for going to the effort!
I think that effectively the DC 22mm bar will be far stiffer than a DA-designed 22mm bar (if it were available, or custom made).
To put it simply, and this is just my understanding, the shorter the bar, the stiffer (similar to springs). Consider putting a 1m bar into a vice and bending it, and then try a 50cm bar.
Research on some US forums on the implications of going too stiff, there may be some detrimental handling side-effects (on the road, not the track) as well as structural issues if the car is pushed too hard. I have heard of subframes cracking and separating as a worse-case scenario.
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