Well the first thing to notice is, there are no free revivers in that list and most of them have low HP. One thing you could do, is add in like an Undead to help smooth out your SP curve. Outside of that, I think you need to play to your strengths. With lawtia, you have two unique things that other sphere's don't. A) Shade, and B) Timing based grims that can turn the game around. I still think that adding 2-3 shades should be the first step to any lawtia rush, landing them can give you a 2-3 SP edge as early as turn 5, and there is no reason not to try to take advantage of that. Secondly, you might want to try to work in some timing based trick. You got a few good grims like deaths embrace, bitter destiny, and consuming grudge. Since you got a bunch of units with low HP, you could just try putting aano SS fourth and try to line up a grudge into it.
The True Hero / Callonia