Thanks, trying it now~
Edit - Took me a while going through the thread to find the solution. This worked for me.
No CDs in normal quests was really helpful; no CDs in Squad Arena was weird, since the other team also had no CDs. It made for a pretty lame stalemate.
OHKO in Squad Arena didn't work for me; might try it again without no CDs and see if that's why, or just using OHKO all modes.
Update: Using OHKO in all modes also worked for Squad Arena, but with the same problem. I lost that arena match in about 5 seconds.
Trying OHKO in all modes (with the other 2 options off) worked, although all enemies also could OHKO my team (which has been reported many times in this thread, apparently, as opposed to enemies requiring 2 hits to kill your units), so... I don't think I'm going to use that anymore.
So basically no cds seems to be the most useful as long as you aren't using it in Squad Arena; the OHKO is nice if you only use super fast characters that can almost always guarantee first attacks, I guess? (At least, based on my experience!)