I use Stormbolt and one of the best advantages of using it is that you can toss it at the shredder while it's landing, mid-charge as you head back in. It'll hit the shredder a half second later, giving it time enough to be debuffed, and it gives you that little bit more slack on your timing for your other two GCDs, in case of something happening (or just lag).

Also since it's a ranged attack, you can make it your first GCD even if you are having issues getting back to the shredder. Perhaps a set of Missles got in the way, or some loon dropped a sawblade on it, or it jumped deep into the fire and you have to heroic leap over to the other side. Stormbolt will hit it anyways giving you an extra 1.5s to reposition yourself without losing a GCD of DPS during DFA.