Hopefully you'll start hearing experienced reefers tell you to shoot for stability over a specific value for your tests. In my opinion, your CA could come up a bit and your ALK is on the high side (also i'm guessing that value is in PPM?), but it's much more beneficial to keep them consistent vs chasing a number.
As far as zoanthids, I think thats a good choice. I would personally avoid other easy to keep corals that most new reefers flock to like xenia, green star polyps (GSP), fingers, etc. Mushrooms "can" be a good choice; at the end of the day nothing is going to take over your tank unless you let it do so over time.
For softies, such as zoas, palys, mushrooms, etc focus on ALK, PH, Salinity and temp. CA doesn't really affect them, it would be beneficial to test your MG, just to be safe. Buy some mid priced zoas, if they live... you end up with some decent stuff which you can always sell off if need be and if they die theres no great loss.