Critical Ring's "Instant Death"

So far from the tests I have preformed it seems to be correct, hitting 80k on Skelegon and 85k for the other ones at skelles, which are correct. Furthermore I was testing it at Oblivion 4 and seeing 141k which is also correct. However I think some of the monster's HP values were changed, I noticed while making one of my ring mules that the max level 3 snails skill (40 dmg) one hit kills red snails (should have 45 hp), I also remember that max 3 snails would not one hit kill red snails before... but now it does. So its possible they changed the monster's hp values for various mobs: Although unconfirmed.

As for the 1st hit being the only one hit kill hit - I have not been too observant to pay attention to what hit it appears (2nd, 3rd ...) I have not seen multiple 1-hit activations in a single attack group (4 shots with cannon).