From what I have gathered after reading Andre's responses to other people, RMS is not based on whether the ICP says an element is elevated or not. What Andre asks you to do is use the ICP tests that he recommends because he trusts how those tests are set up, run, maintained and calibrated. Once you have the results from those tests he asks that you enter those results into HIS calculator to decide if an element is OK, low or high. He doesn't use the ICP recommendations for those results.
So, your findings will only tell you results of how those identical samples were calculated using different machines with different algorithms run by different people of different education/skill levels. None of your findings will have anything to do with RMS. Now, if two people use these results (Say one from ICP Analysis and one from Oceamo) simultaneously in the RMS calculator they will get different recommendations. This is why Andre recommend everyone only use the three (Triton, ATI and Oceamo) and he further recommends Oceamo as his preferred. I believe this is because he has worked with them to develop a lot of this stuff.
I fully understand how Andre and RMS use ICP and that you don't use the recommendations from each company. That is not my goal in "testing" each company.
It is to test "how consistent are they" and can they be trusted. If you send two identical samples to each lab and they don't match up (each company independently) then it gives a serious lack of confidence. I won't compare company A to company B for example. I am testing how does company A test sample 1 and sample 2. How does company B test sample 1 and 2. And so forth. I already know the answer for a couple of the labs and it is not promising in any way.