IMHO, 'sorting' is not the problem. It's getting that collection of data into a usable form, in this case a graph. That's why the "Find" combined with a 'multi element sort' sounds needed. You don't really want a graph showing values from widely different types of tests, that could give wildly distorted results/impressions. It sounds like the basis of any comparison graph is to use one key variable, like the type of test, and build the graphs with the other variables and values with them.
That's why FMP is so easy to use, no need to keep track of what row, column you are in. An easy to use/view 'form/layout' is a snap! All finding/sorting/presentation is fully scriptable or can be manually done, if desired. You might be able to use Bento, but it is much less capable (than FMP) when it comes to mathematical formulae.