What I find odd is that this was never a serious problem with older road rims and tires now suddenly this issue has popped up, I think it may be due to the newer deep dish rims having a lot more material there is potential for the rim not to be perfectly balanced. You will find that the heavier the wheel/tire combination of a car/truck, plus all the suspension components, plus the mass of the vehicle, the more weight is usually used to balance the wheels, but most of that weight added is due to imperfectly made tires as they all are, but the larger the tire the more any imperfection is exaggerated.
The only time I ever had an issue is when I located my computer magnet on the same area that the valve stem was, so I relocated it and problem gone. Back in the days before deep dish rims any unbalanced situation, if any, was minor, and we found that by moving the tire 1/4 a turn at a time on the rim would eventually balance the rim, or narrow it down so the next time you move it you may only have to move it an 1/8th of a turn, so this could be utilized today.
Watch this video and I will point out something:
View: https://www.youtube.com/watch?v=dcgiUcbS64c
Note as he's goofing around trying to balance this wheel where the tire's label is...yup, it's directly opposite of the valve stem, if he had moved the tire instead his balance issue may had resolved itself.
Here's another balance video:
View: https://www.youtube.com/watch?v=YhaUfda6aSY
In this video note where his computer magnet is...it's located about a 1/4 of turn from the valve stem, next note where he puts that clunky counter weight...yup directly opposite of the valve stem right where he should have first located the computer mag! Also in this video I cannot tell where the label of the tire is so I can't comment on that, but once he had moved the computer mag to the correct position and checked the balance he then should have tried to move the tire on the rim to see if that would have taken out any other balance issues.
The other issue with these balancing videos is that we don't ride our bikes upside down! So a lot of this is simply do nothing mumbo jumbo, unless you can feel it while riding it's not a concern. Read this article for indepth detail about balancing:
http://yarchive.net/bike/wheel_balancing.html