Hello, my name is Carlos but I go by Carl as well,
It seems to me like you might be adding way too much salt in the system, if I'm not on the opposite side of the coin, you are using a salt based system, and what this does is that when the system has too much salt in it, it might soften the water a little too much for your preference, at least this happened to me, I used to have a salt based water softening system (I don't anymore, I changed it to a reverse osmosis system, I didn't think salt based system was doing the job well) and I had the same problem, little did I know that I was supposed to as about 3/4 of a bag of salt to a full bag of salt only, and I had been adding 2 bags! Then I read the instructions on the thing and it said that water level should be 4- 6 inches and my water level was up to 10 inches (That is why I would recommend reading the manual before trying anything too fancy).
You can alternatively call support for your fleck 5600, I am saying to check this because it is what happened to me, however you might have a different water softening system and well, not all water softening systems work the same way, specially because it is a salt based system and depending on you water type you might have another system, however you should research about how much salt you are putting in it because if water gets way too soft it could be because of that. I did find some info that might be of help to you on this water filtration system site :
https://www.waterfiltersystem.org/best-water-softeners/#Fleck5600 I would recommend you check it out as they have some important info about your system that you might not know of.
Other than that it was all I could do, I hope my post was of help to you in some way shape of form. have a good day!
