I'd just like to add to Steve's great advice, here. Not only should you consider staggering, you should (take advantage of your great doser) dose throughout the day. It will hold your levels "perfect," and with next to know sway in parameters for Ca/Alk/Mg. I owned that pump before but I didn't like that it pumped so fast. I would recommend doing a test on it to see how much it truly doses in a minute period, by letting it run for 10-20 mins into a beaker. See how much it doses, and divide the total ml count by by the minutes you let it run for. That will give you a true time/min estimate. From there, use BRS' calculator to get started on a dosing time for each solution.
Reef Calculator - Bulk Reef Supply
I dose using 1.1ml dosing pumps from BRS. I like the accuracy of them. I do plan on going with something a bit more trick later on, but for now, these serve their purpose well.
I set mine up to dose a little bit throughout the day (24 hour program on my Apex). You should try to do the same, since you can. Maybe one hour do a little Ca, then the next hour do a little Alk. Mg can be dumped right in (literally) as it's quick upswing doesn't impact the tank as much one would think. But I'd only recommend that with BRS Mg since is pretty diluted. If you're using Kent Tech M, it's a bit more potent and I'd pour that in slowly. Of course, if you are using your dosing pump (one of the channels) it doesn't matter at all as it drips slow enough.
Personally, I dose around 70ml of Ca and 80ml of Alk everyday. For Mg, I just pour 14oz of it in my sump every week. My tank is 99% SPS so my demands are a bit higher than some.
Hope that helps! It's much easier than it sounds.
