ffs, I wish I knew how you do this, even with eve and minikin atma's I can't break 1k... Granted I'm not using memento mori, but compared to everything else it shouldn't make THAT big a difference.
You're better off with eve and minikin (10 more str). I've done 1550 on murex with ascetics drink, 1380 without, and I'm a hume.
Also, don't use snow ring, it has -2 str. If you have time, those augmented diamond rings from vunkerl are perfect and BLU can easily solo the gold chests to get them. Basically a free int+6 ring with mnd on it. The BLU+1 feet will boost your damage a lot too.