Dosing can be very tricky to get a hang of at first. Some tanks can really get screwed up someone starts dosing w/o really understanding what is going on in their tanks (chemical level-wise).
I'd say that your may have had an issue by just dosing the max that the bottle said and not based on what your tank levels are.
For someone who isn't a chemist, it can take some time to wrap your head around the relationship of Ca, Mg, Alk and pH. They all interact with each other in your tank. And there is a balance with each that you will want to maintain in the tank.
This is what I'd do moving forward, first off I'd do several larger water changes for several days in a row to get the chemistry in the tank back in balance and back to levels that they should be. This is the easiest way I find to do this. Alternatively, you can keep testing and adding chemicals until it all balanced out at levels where you want, but this can sometimes really through the system out of whack if you are precise with what you are adding.
Next you need to find out how much your tank is consuming in a week's time of Ca, Alk and Mg. In this time don't dose anything or do water changes. Just monitor daily (if you can) or every other day, how much the levels are falling. I'd recommend testing for Mg as well. Don't worry about pH. With weekly water changes you shouldn't be having any issues with pH.
Now that you have a better understanding of how much your tank in consuming. Do a water change. Test before and after the water change. Did the water change bring the levels back to where they need to be? Are you a little low on Ca, Alk, or Mg? Answering this will help you determine what to do next.
If you find that your levels are low, then you can start to figure out your dosing regime. I'd do another water change to get your levels back to where you want them. Once you have the levels where you want them, you are gonna want to maintain the levels. To do this you are gonna dose small amts of Ca and Alk on a daily basis.
To find out how much to use, I use an online calculator for the two part dosing I use from BRS. Choose two-part instructions and recipe instructions for bulk package materials. Go ahead and make a couple of days additions and then test. If you find the levels are dropping this means you need a lgr daily dose, if going up, use slightly less. Most people can hone in on their tanks consumption and daily dose needs in around three series of tests. Want to add slowly and in a high flow of tank. Important for Alk portion, b/c does raise pH. Sometimes it is easier to add pH at night, when the pH levels naturally fall a little. I have my doser dose Alk in the middle of the night.
Listed below is my go to list when I need to read up on any issues with Ca, Alk, pH, and Mg.
Dosing Calcium and Alkalinity
The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
http://www.reefkeeping.com/issues/2007-03/rhf/index.php
The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 2: What Chemicals Must be Supplemented
http://www.reefkeeping.com/issues/2007-04/rhf/index.php
Aquarium Chemistry: The Chemical and Biochemical Mechanisms of Calcification
http://www.advancedaquarist.com/2002/4/chemistry
Chemistry and the Aquarium: Calcium
http://www.advancedaquarist.com/2002/3/chemistry
http://www.advancedaquarist.com/2002/3/chemistry
Calcium
http://www.advancedaquarist.com/issues/mar2002/chem.htm
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
http://reefkeeping.com/issues/2006-06/rhf/index.php
Calcium Carbonate as a Supplement
http://www.advancedaquarist.com/issues/july2002/chem.htm
Purity of Calcium Chloride
http://www.advancedaquarist.com/issues/mar2004/chem.htm
The Relationship Between Alkalinity and pH.
http://www.advancedaquarist.com/issues/may2002/chem.htm
What is Alkalinity?
http://www.advancedaquarist.com/issues/feb2002/chemistry.htm
The Chemical & Biochemical Mechanisms of Calcification in Corals
http://www.advancedaquarist.com/issues/apr2002/chem.htm
Articles on how to keep Ca and Alk in balance:
When Do Calcium and Alkalinity Demand Not Exactly Balance?
http://reefkeeping.com/issues/2004-12/rhf/index.htm
Calcium and Alkalinity Balance Issues
http://reefkeeping.com/issues/2002-04/rhf/feature/index.htm
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
Additional details on how each are used are provided in these articles:
Comparison of Calcium and Alkalinity Supplementation Methods
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Calcium carbonate/carbon dioxide reactors
http://reefkeeping.com/issues/2002-05/sh/feature/index.htm
Limewater (kalkwasser)
http://reefkeeping.com/issues/2005-01/rhf/index.htm
Do-it-Yourself Two-Part Calcium and Alkalinity Systems
http://reefkeeping.com/issues/2006-02/rhf/index.php
A Guide to Using Calcium Reactors
http://www.reefkeeping.com/issues/2002-05/sh/feature/index.htm
The following calculator and articles will help guide aquarists through the process of fixing calcium and alkalinity imbalances in reef aquaria using these types of supplements:
Reef Chemicals Calculator
http://home.comcast.net/~jdieck1/chem_calc3.html
BRS Aquarium and Reef Calculators
http://www.bulkreefsupply.com/reef-calculator
Electronic Calcium Monitoring
http://reefkeeping.com/issues/2005-04/rhf/index.htm