As I said in post #79, the Plant Magic web site doesn't say if there is any dolomite lime in their mix. If not, that's likely what's causing the problems. You might want to email or call them to verify that.
Lime is slow acting, especially dolomite. Hydrated is faster acting but also toxic if used in excess. I generally find hydrated takes 3-4 days to start moving the pH. Dolomite can take weeks.