I don't know the formula, but on my chanter I notice that LB's are easy to lull, as are lower dark blues. The closer the mob is to your level the more resists/critical resists you get, and it seems to be on an almost exponential scale. This is not particular to lull: root gives me the same issues.
Best bet is to make sure mobs are at least 4-5 levels below you.
Regarding if they were changed recently...I haven't noticed anything since uthgaards giant spell file revamp. Prior to that lull was practically irresistible, and for a little while I think they overdid the resist rate and it was almost unusable. But they seem to have gotten most of the kinks out by June and I haven't seen any real changes in reliability since then.
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Jorg Shaman
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