If alk is high and Ca is low, stop the alk but continue the Ca. Both are required for coral growth - without sufficient Ca the corals cannot use the carbonate alkalinity and bring the level down.
Try to figure out how your levels get this way? Were you dosing more buffer (alk) to try to raise the pH? What additives are you using? What doses?
Is the pH level causing problems? If not I would not waste too much effort trying to raise it. Once your tank is back in balance maybe try implementing some kalk in your dosing regimen - it will raise pH without sending alk levels sky high. Otherwise you can do more harm than good trying to get 'textbook' levels.
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