RSCP and it has been mixing at 8.5 and dropping to the high 7's after a week of storage. Not too big of a deal though, as the kalk brings it into my target zone of between 10 -11. So far, so good. I've considered lowering it, but it stays pretty reliably in that range.
Hm…That should be mixing much higher. Makes me wonder if your salinity tester is off. Have you always run 10-11 Alk?