Yes, it would safe to get in as you would still actually be below "shock level" for your CYA. Old swim suits are always advised when FC is above your "max" level on the best guess chart.

Testing and adding chlorine to maintain that 30 level 3 times a day would be great! You need to keep at it until the water is clear, there are no signs of algae, and you can pass the overnight test. Do you know how to do that?