Mech build question

Edit: iirc Resistance characters aren't able to use job-specific sp in lower jobs (i.e. no 3rd job points in 2nd job skills). Might be wrong though.

This is right.

I also left my Healing Bot at 18, and even with the buff it gets in Chaos I'm going to leave it at 18. The only reason that I'm leaving it there is because you can't get the heal from just being in the bot's area to get the heal, you have to tap the down button to get it, so it's not useful in just about everywhere. The only place it might be of real use is as a lower level Mech in ani runs, but I've never once died there at my level or gotten close to it, so yeah.