I don't and never have been a T/M user, but I have as you say, used a C F R with variable pressure, up to 400 psi.
As mentioned, there were very few occasions, when I found it necessary, to exceed 200 psi and I believe that to be the case with at least some T/M users.
Perhaps it's to do with the prespray / aggitation regime followed by the many, who are happy to use portables, for whatever reason.
What a carpet manufacturer says about cleaning may not be "best advice" and should not be followed blindly....................they change their minds !
A colleague of mine startled the main supplier of commercial carpeting recently, by achieving a better result than he'd ever seen, on a trial clean, in a hospital, where H/W/E had been the stipulated method previously.
Now this man had seen many users of H/W/E and was happy to recommend the other system, which was a bonnet mopping system.
Pete...............Experiment, before assuming your wand is knackered, worn or damaged jets don't ammount to a replacement wand !!!!!!!!!!!