OK,
I think you are better off than you think.

Yeah, your calcium's a bit high, but not terribly. For your pool CH should be in the 200-400 range and you are hitting 430-465...The diff between the pool and the spa could be do to two obvious factors:
1) Simple measurement error. It's not an exact science and your variation is less than 10%.
2) This is a new hard-sided pool. It's still curing. It's very possilble that the spa, with a different quantity of water, at a different temp, is curing differently. Again, only a <10% difference--not to worry.

I would use the rains as an opportunity to drain off some of the hard water--rain is soft--to get CH below 400.

Meanwhile, T/A: The low T/A is making it a little tough to keep pH steady, but it's also preventing the CH from causing a BIG problem. Follow Chem_Geek's advice--my rule is ALWAYS add stuff slowly, wait, re-test, and add more. Given your slightly elevated CH, aim for T/A to be around 80 or 90--but that's when pH is between 7.3 and 7.6--T/A rises and falls with pH. If pH is higher, then a T/A of 80 is a bit low.

pH: You have TWO factors raising pH--the SWG, as you know, but also the new concrete/shotcrete/gunite/tile/plaster pool. These pools are NOTORIOUS for increasing pH as they cure...adding Muriatic acid to control it is the best thing.

CYA/Stabilizer: Normally 50ppm is the high end of what I like (there are technical reasons why higher levels can be preferable--Aylad runs at 80ppm because of them). But the SWG manufacturer will have a recommendation--usually higher. I'd like to see you stay at the very low edge of that. CYA is EASY to add, hard to get rid of. You can use a floater with Tri-chlor pucks--it will fight the rising pH as well as Tri-chlor is VERY acidic.

Or you can add CYA and let it dissolve. I ALWAYS recommend you compute how much CYA you need and add 1/4 to 1/3 of that--no more. Wait 48 hours to a week for it to fully dissolve and measure CYA. Repeat as needed.

Chlorine: You didn't post levels. "Normal" means little to us. You have Free Chlorine and Combined Chlorine/Chloramines. The former doesn't smell. The latter smells like "chlorine". It usually means you need to shock your pool. If otherwise it's just fine then simply shocking it once up to 15ppm (since your CYA is 50) should be all you need.


Still, I think you seem to be in good shape. I suggest you get a good FAS-DPD Chlorine test kit--but we suggest EVERYBODY get that, whatever the brand.