Yes, this was another 10 man Sapphiron parse. Here is the link to the WWS of the more recent parse: Wow Web Stats
Originally I had thought that everyone except Mechenos was in full frost resist gear plus Improved MotW, but 4 of the other people in the raid had relatively large amounts of sub-30% resists, leading me to believe that they removed their frost resist gear before the pull (since I checked everyone's gear myself beforehand to make sure they had it on) or somehow lost their MotW buff. The parses that I deemed to be clean were myself, Azelle, Makeesh, Zant, and Zarrea. We had no shaman for totems and the only aura I can find in the logs is retribution aura. However, it's not impossible that I screwed up somewhere, either in parsing the log or in determining who exactly had which buffs and frost resist gear.
At the very least I can verify the accuracy of my numbers from that log (assuming no outside source of resistance, which appears to be the case from the combat log), which are:
30% resist: 39/171 = 22.8%
40% resist: 76/171 = 44.4%
50% resist: 51/171 = 29.8%
60% resist: 5/171 = 2.9%
Those numbers look much closer to what you got out of my original parse, so it's likely that one or more of the other people that I counted actually had more than 362 resistance, perhaps from the crafted ring or a flask.
Edit: Ok, after going back through it looks like Zarrea and possibly Zant had more than 362 resistance. Removing Zarrea's numbers gives
30% resist: 144/695 = 20.7%
40% resist: 303/695 = 43.6%
50% resist: 224/695 = 32.2%
60% resist: 24/695 = 3.5%
If we remove Zant's as well we get
30% resist: 111/527 = 21.1%
40% resist: 235/527 = 44.6%
50% resist: 164/527 = 31.1%
60% resist: 17/527 = 3.2%
Of course, it's not exactly rigorous to remove data just because it doesn't feel right or match our expectations, but Occam's Razor says it's more likely that they simply had more resistance than I thought.