Like I said, I have strugged to find either subjective or objective evidence to support either way and that link was one case of subjective evidence supported by someone who has actually done the upgrade and in his case, found benefit in the change.
I am pretty sure there is a U2L IPRA 1200 in Vic runs a watts linkage, would be interesting to here from him why he installed one and what the differences are, I think his name is Simon Phillips. I also think he holds some U2L lap records?

Harry.
Did you end up selling the red car? If so do you know how it is going these days? It was certainly an inspirational build for many of us out there, I have always liked how it looked on the track.

Bryan