Dug my DK2 back out, and got it hooked back up in my engine. I somehow had emitter simulations run per eye per frame instead of per frame. Also need to enforce soft particles in VR maybe. What a productive lunch break.
Mismatched per eye.
Much better. :3
Double-checked shadows and reflection probe are once per frame. ;3
Update a walk in the woods...
Very Large Area Test.
Same Area in with HMD off vsync'ed 60Hz.