So it will change the tracking... Big deal.
Virtually every TT/TV matchup will track differently than another one... You just get used to it.
Even the Hensly hitch will cause tracking to be different than a standard WD system. They tell you that right up front.
It is NOT a big deal at all.
As for the OPs observations.
We had an extensive thread on this awhile back. It's focus was on whether a longer drawbar necessitized a hitch capacity rating reduction.
The mod. contacted some manufacturers for input. An engineer weighed in. The consensus was that it DID not for the very reason the OP measured.
I wrote about my experience in going to a longer drawbar, making my ride bouncy when lightly loaded. And surmised that the WD bars may have been adjusted too tight with the new bar. I never got around to readjusting them, as I got a new truck, but I am glad to see the OPs before and after observations which corrosponds with what I felt back then, as well as the opinions of many in that thread.
Good info and good work.
Thank you