I think you are correct with your 25mm, obviously this is going to increase the torsional stiffness & tame any wayward roll.
I looked into changing my standard bar to the uprated offering but couldn’t find one which was wallet compatible.
I had a collection of rose jointed rod end, enough to assemble a full set, which gave me a range of adjustments from standard upwards. I adjusted them buy the same degree, enough to make it obvious there was more tension in the system & subsequently forgot about them.
As expected there was a little less body roll (or was it psychosomatic),
It was quite a long time ago.
I look in on them when I’m in their area & they are still well & quite shiny.
M

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