I also run a 38/40 fire lure, which reduces resistance by 941.
Keep in mind both of these screenshots were taken within 20 seconds of each other with the same mobs and same stats/gear. Notice that I managed to hit 3378 (and I probably have hit lower, just only now decided to take a screenshot), which is approximately 47.2% of my maximum hit. Huh?
IMO with a high lure, fluctuation should not vary from more than 25% of your max possible hit. This makes absolutely no sense..