The best possible thing to do with Soul Eater is get as MANY Natural Attacks as possible.
Flurry of Blows and Snap kicks gets you what, 8 a round? Then the two claws and bite from feral turn that into 11 attacks. Then those Abberant feats to get you two tentacles. Be a shifter, that's one more, then warshaper gets you another attack. Without trying to hard, that is... 15 attacks per round. Each bestows two negative levels. Oh hell, turn your other side into a Druid! Turn into an Octopus! That's... 8 tentacles, 8 unarmed, 1 warshape! That's 17 at half the cost! And you get full Druid casting
And as said before, if you could swing Totemist into it, that's a considerable more amount of natural attacks.
Other things to try, if you can get the type for it, Rapid Strike. There are also grafts to add more attack options. And template stacking, which is actually a really strong option here.