Honestly, even if you didn't actually test the boards, just posted up the specs and reviewed them like that.. it would be heaps better than what the manufactures give you. Usually on their sites its all over the shop, even same company to different board, its hard to work out.
And I don't think I've ever seen actual specs on sites about the VRM. Which is amazing to see you've posted here.
Not sure how you do the costings on this type of review, but maybe in the future, you can work with a local PC store, and have them send you a bunch of mobos, for you to eventually return ... then they can sell them as open box or whatever. (and have them sponsored/mentioned in/through the roundup/review)