I am aware that the last two disprove the formula of gravitation given by Newton. However, my thinking is that while such a view of gravitation may fit better with relativity, that such has not been proven yet. It probably does fit better with other things we have learned since, but better fit is again an assumption. My question was more regarding experimental evidence and how such an experiment could be accomplished.
Absolutely. Remember, a theory will always be a theory no matter how much evidence in accumulated. I know there is still much to discover. My original post was that even though it's called a Law of gravitation, it does not fit all of the observed phenomena.