Thanks for all the feedback. To explain myself better, I was aiming to build individual critical tables for different titans, based on 2D6 rolls and a range of results made up of the above categories (plus a few more minor ones like "shaken - extra blast marker" to balance out the more horrific varieties...).
This also enables balancing critical tables so that larger titans are more resilent than the little ones, and general balancing against the current Titan points and criticals. Maybe with a few tweaks, eg current Warhound titan crit is pretty naf compared to that of other equivalent titans, and Warhounds are an extremely popular choice anyway so a greater range of critical results wouldn't hurt.
I've been drawing on the Epic40k critical tables for inspiration in particular (which by the way arkturas, is where I introduced the current EA bio-titan criticals from a couple of years ago!!

).