If you have a salt chlorine generator, then you don't really have to worry about adding too much acid, because Ph will go up and may be why you can't get it down very easily. If not, then ignore this comment.

Another thing you can do is to use the acid demand drops if you have them and see how far you are above 8.2. After you do your test, add them one at a time until the water changes to something immediately below pink. Then do the same thing the next day. Hopefully it will take fewer drops each day to turn the water. If not, then you may need to be adding more acid each day to get you there since you are not making any progress.