One thing you need to consider is your calcium and alk consumption rate. Remember, if you have corals or clams in your tank, then they will consume your ca and alk and you need to know how fast they do that before you can tell if you'll be maintaining or increasing your levels.
The simplest way to find the consumption rate for your tank is to measure the alk, wait a period of time - a day or a week or whatever without adding any 2 part, and measure it again. The difference between the 2 numbers divided by the number of days between measurements is the daily consumption rate. That's how much alk you'll need to add on a daily basis to maintain your level. If you want to increase your alk, you'll need to add more.
One other thing, it's my opinion that maintaining consistent alk numbers and keeping the ca and alk in balance are more important than the actual level. Looks like you've got a good target level, the important thing now is to get to that level of alk and keep it there and to balance the ca to the alk level.
