Help sought for Grav/Kin APP/PPP

[biostem]

I have a 50 Grav/Kin that I've been playing, and have all Incarnates up to about rank 3.  My current APP is ice, using the single target blast, the armor, and ice storm.  I'm looking for input on a second build for the character.  I'm leaning toward Scorpion's PPP since it also has a defense toggle, and the ST blast does -RES and -DEF, plus another AoE blast if I wanted it.  I've also been looking at the fire and psi APPs, but am not as sure on those - I tend to prefer defensive armor toggles on squishier characters.  What are your thoughts?  Thanks for reading!

[Uun]

Stone Mastery - Fissure, Rock Armor and Seismic Smash