444 indeed. My "miss" ratio is most often anywhere between 10-15% (before melding, I was closer to 15%++). And I do try to add damages as much as I can, which means, with an average team, I dps quite a lot. 15% is quite a lot.

Haven't saved any parses of these dungeons, but I'll check again next time I go. Hopefully by then, I'll be above the 450 acc bar and have the misses fixed.
Doesn't change the fact the heavy melding is requiered. I'm sitting on +90 acc melds at the moment (add an extra +9 for the cap?). That means a lot of gils necessary to reach the cap, considering the insane number of failed overmelds one can expect.