JasonLion said:Getting one better/larger filter is much simpler than having two filters, and will work just as well as, or better than, two smaller filters. Moving the filter to the deep end of the pool might help just a little bit. For the best possible circulation, you want the return to point to the side and down into the deep end of the pool. There isn't any way to do that from the shallow end.
However, improving the filter will not solve any of the issues you have mentioned in any way.
One important distinction you are failing to make is between free chlorine (FC), combined chlorine (CC), and total (TC). Your test is measuring TC, which is the sum of FC and CC. CC is the part of TC that causes problems. FC does not cause problems. When FC levels are maintained appropriately the CC level will go to zero and the problems will go away.
Chloramines, and the trihalomethanes present in swimming pools, are all CC. You can get rid of them by using more chlorine and maintaining the correct FC levels. To do that reliably you need to have a test that distinguishes FC from CC, which your current test does not do.
I have one of the drop test things somewhere I just cant find it. Darn kids moved stuff trying to find pool toys last weekend.