Mary,
Can you print out your spreadsheet? That way, if a dose increase is suggested, you can show her in black, white, and a rainbow's worth of colors what has happened at higher doses. If she just randomly says "no, you need to raise it to 2 units", then just ask her to please explain the rational behind that. If she makes sense, then consider it, post it here and let us kick it around. If she doesn't, then do what we usually suggest.....just nod your head, say things like "yeah, okay, uh-uh, right", then smile, drive home, and do what you want to do anyway. You're in charge of Sumo, and you pay her salary. In this case, she is working for you.
Sure, you can mention this board. I did. I also brought Binky's canned food lists with me. As soon as I took them out, my vet said "Binky's list, right?" She'd already seen it. Now, why she still prescribed Hills M/D is beyond me, but she was familiar with the food charts. She knew low carb was a must for sugarcats. I guess she just believed that the Hill's stuff was low enough (the lowest Hill's she could prescribe), and she probably thought it had to have better ingredients. I don't think she really researched nutrition that much, and got sucked into the whole prescription food is good food vortex.
I was lucky, my vet had no problem with that (Binky's) , or with this board. She wasn't "on board" with us, but had no problem that I was. If your vet has never heard of FDMB, then maybe she'll at least take a peek? If she has heard of it, and doesn't like "us", then that'll tell you all you need to know, I think.
Carl