Did you get a proper test kit yet? If you are still using test strips, it will be much more difficult to maintain your spa properly. You've already seen how they aren't showing the CYA level properly since for every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm. Bleach does not add any CYA so is a better form of chlorine to use when you don't need to add anything else. You do want some CYA in the water since it significantly moderates chlorine's strength which would otherwise be too strong -- hence the "Dichlor-then-bleach" method.
Dichlor is net acidic. Though it is fairly pH neutral upon addition, chlorine usage/consumption is acidic so when you switch from Dichlor to using bleach you need to set up your spa to minimize carbon dioxide outgassing. You do that by lowering the TA level (see how to
Lower Total Alkalinity) to around 50 ppm and you then add 50 ppm Borates (such as by adding boric acid).
If you didn't have an ozonator, then one person soaking for 45 minutes would need a little less than 4 teaspoons of Dichlor or 3-3/4 fluid ounces of 6% bleach (or 2-3/4 fluid ounces of 8.25% bleach). With an ozonator, you may only need half these amounts, but the real rule is to add whatever is needed after a soak so that you still measure a chlorine residual 24 hours later. As for the FC goal, most people don't want to start their soak with more than around 2 ppm FC in order to minimize noticing the chlorine since it combines with sweat fairly quickly, but that's up to you. Given the risk of getting too low in chlorine in between soaks, you might target 4 ppm FC except for the day you plan to soak where you can add less so you start with less at the start of your soak.
The difficulty you might have is that with an ozonator the chlorine demand in between soaks may be around twice that without an ozonator. With no ozonator chlorine loss is around 25% while with an ozonator it might be 50% or even more. So an ozonator works well when you use the spa every day or two, but using the spa infrequently is more work since you have to add chlorine nearly every day when not soaking. Just see how it goes -- it's not really different than when you were using Dichlor so you may already have a feel for how often you need to add chlorine to make sure it doesn't get to zero in between soaks.
It's too bad spa manufacturers don't have a switch to be able to turn on and off your ozonator because ideally you want to use it right after your soak for 24 hours, but turn it off in longer times between soaks if you are only soaking on weekends, for example.
