You set the hard water setting to 25, did you test the water? The hardness setting has little to do with the salt, it has to do with how many gallons the system is good for and how often it regenerates. The salt per cu. ft. s determined by the brine refill time. Do you have the model number of your system? Or can you post a picture of it?
In general, the water should not have a salty taste. The "salt" taste is a combination of sodium and Chloride, NACL, the water exiting your system should be lacking the Chloride portion of that if the system is working properly. The chloride is a waste product during the regeneration.
Hope this helps.