I'm not a fan of the new way resists work, including the nerf to resist auras. Before making a formal complaint, I want to do some tests to figure out the formula currently being used. I would appreciate any help that people could provide. If you do some resistance tests, please post here with your results, Cnt/Cnc, gear, and skills. The more data we have, the more easily we can solve for the formula being used.
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The original post/data below was before the current resist patch:
Testing is still underway. I'll be refining the system to make it easier to count resists, adjusting more factors to better be able to understand the formula for resists, and doing extended tests to account for RNG variation.

Things of note so far:
-T5 resist gem was less effective than both T4 and T3 (though I only had time to test for one set of Cnc/Cnt values for that). It could just be down to RNG. Only 360 casts were done, so it's possible.
-More resists with 359 Cnt than 380. Again, it could be down to RNG.
If anyone has time to spare, even if you're just sitting there AFK and doing arena on another toon while I test, I'd appreciate the help.