The ALEX system is notorius for overdosing pools. It is designed to maximize chemical sales and NOT balance the water! Find a different store!
Better yet, get yourself a good test kit. A good test kit is the best investment you can make in your pool. It will save you a lot of time, money, and headaches in the long run!
I am going to guess that your 4 in 1 is a Bioguard test kit and the reason it does not have a CYA test will become apparent as you read my post.
We have a a lot of collective experience with testkits and have narrowed it down to two that really deliver for the money. You can read about them here:
pool-school/pool_test_kit_comparison
Anything else just isn't going to cut it. Remember, we don't have a hidden agenda to sell you things (TF TESTKITS is a different thing from TroubleFreePools but we support them because their testkit is a good value for the money and their customer service is incredible but you can also order the Taylor K-2006 from several sources online or directly from Taylor (or the private label version from Leslies. ) Very rarely will you find this kit for sale in pool stores, usually they sell the less expensive (and much less useful) K-2005 which you do NOT want!
A question on your 4 in 1 kit...does the chlorine test turn yellow or red?
I am curious how you got a FC of .4 since that is not the type of number that either OTO or DPD testing would produce but rather the type of results you would get from and FAS-DPD titration which I am sure you do not have. Your chlorine test uses a color comparator, right?
Adjust alkalinity is just TA that has been adjusted for CYA. I noticed that the store did not give you a CYA reading since Bioguard's stance (and the coperate stance of their parent company, Chemtura, all their other brands such as Aquachem, Guardex, Omni, Pooltime, and Sun to name a few) is that CYA levels up to 200 ppm are not a problem in a residential pool. However, we know better and you just have to ask our members if any of them ever had probems from an ovestabilized pool and dropped hundreds at the pool store trying to fix it!
Based on your TA and adjusted TA I estimate your CYA at about 60 ppm which is the high end of acceptable for a manually chlorinated pool. If you are using trichlor tabs NOW is the time to stop using them before you start having problems with your pool.