Hi MrsO,
Welcome to the forum!!
It sure sounds like you've done your homework and have a good handle on what's going on in your pool. Regarding the test kit--the K-1515 kit at the Amazon link in my sig is what you'l need to do DPD-FAS testing, which you'll need with a high CYA pool. It's the standalone FAS part of the kit, so it would be a good addition to the kit you already have.
The numbers that you posted look just about perfect to me. If you're planning to stop using stabilized chlorine (which I would suggest you do because of the CYA, which you already know), your TA is exactly where it needs to be. If you were going to continue to use pucks I would suggest you raise it a little, but at this point if it were my pool, I would leave it alone.
Your CYA is a little high, but that's not necessarily a bad thing--I don't know where in Ark you are, but if you have the same climate as I do in Louisiana (and full sun on your pool), you'll likely find that the higher CYA helps you actually reduce the amount of chlorine you have to use, and it also makes dosing less frequent. I run mine around 80-90 ppm CYA, and only have to dose every 3 days or so with a high swimmer load. All you have to do is up your chlorine levels to compensate, which it looks like you've already done. Check out the link to the "best guess chlorine chart" in my sig for more information there. Frankly, what you've got in your pool right now looks right on target for a great swim season. !
There are some unstabilized tabs available, but they are made of cal-hypo. They cannot be used in a feeder, and they react very badly with trichlor, so you don't want to put them in a floater that has contained trichlor in the past unless you know ALL the trichlor is out. I will tell you that they aren't very good, though--they used to have some good ones that were shaped like capsules and lasted a long time, perfect for the skimmer--but they don't make them anymore. These newer ones go to mush almost immediately and I won't use them.
My suggestion would be that you switch to straight bleach (plain, unscented, generic) or if you can find it, liquid chlorine (which is bleach but in double strength and often sold in larger quantities so there are less jugs to haul around. When you go on vacation, you could still use the trichlor just for that short of a time, or if you have a neighbor that would come dump a gallon of bleach in the pool for you every couple of days, you shouldn't have a problem.
Hope some of this is helpful--it's really refreshing to see posters come here who have already done the reading and understand what's going on. We look forward to seeing you around the forum this summer.
Happy swimming!
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