I have Recovery turned on when I test force techs, you can set up the A.I. to wake up on Com Reaction - Mid Kick, for further testing if you so choose.
Fast and Fastest Stagger are there to tell you what's really viable on the better stuns (sitdown stuns, gut stuns, uppercut lift stuns, limbo stuns, etc). You don't have to use either of these to develop combos, but it is a very good idea (one I would suggest) to use sometimes. Just to ensure combos aren't just random button presses into Critical Burst set ups.
You want your combos to be something of worth and not something that can just happen on a whim. If you get a critical stun or certain type of stun, then you want to make sure that if option A can be held, then you need an option B that's just as viable to have added mix up potential.
Example: 11P, BT PPPP, and 4H+K all put opponents into a gut stun, which cannot be staggered escaped. Opponents either have to guess with a hold or just eat damage.
Our follow ups here are H+K, 8KK,, 4P, 4P+K, 4K, and 66KK4. All of these things have very good reward, and some even lead into force tech, which in turn makes this that much stronger. We also have potential Critical Burst/throw set ups here.