It sounds like your measuring from the axle to the frame, with weight on the rear tire?
Yes, the sitting height change of the bike, after bounced a few times to settle the suspension.
PS: I am "not" saying your measurement is not good. Yours actually tells you how much the seat height changed.. That is good as it is real world.
To me, the real-world was all I cared about (at the time).
But your methods includes spring sag. Spring sag is different on every bike, so the spring sag has to be out of the measurement to get an actual number.
But it was held constant because I didn't change anything else in the suspension before/after the measurements.... You are quite correct, however, that this will not really address "bottoming out" the suspension on just any Concours. I can't provide an exact number for that, unfortunately. I am not sure anyone really can because there are just too many variables. I do believe it is still useful as a "relative" number, though, because the suspension was "stock" at that point. So if the bike is put back to stock settings (and weight, if applicable), one should still get my results with the Muzzy links and the listed raising of the front fork tubes.