I have this idea; I'll set-up 2 rackets, which I will try to get to feel the same, except that one is heavier overall. IOW. I want to achieve the same feel with both during play, but one will just feel heavier. I will try this with this method and if I succeed I will then carefully measure the specs.
I hope that you could make another plot of those two rackets. Then we can compare the different curves.
I know it's a personal experiment, but maybe we will learn something of it.