Salt can be added anytime you have the bandwidth for it in between slam tasks. (Slam always takes priority). Raising the salt might even help pass the time when you're waiting for the filter to polish out the last bit of dull water. Brushing the salt around will kill 2 birds with one stoneI was getting excited to see a clear pool and didn't want to anything to go negative on me.
But use your salt test as the baseline and not the poolstore.
+10 CYA raises the slam FC +4, on the other hand. So at 70 CYA your target is 28 FC and its expensive to maintain. That one would have hurt.