Do not adjust your pH when used the pH Perfect products. All you will do is fight the pH Perfect technology - you will have to add a ton of pH up/down to try to get it to change.
A lot of people new to the product misunderstand this and think it doesn't work because the pH still appears out of range after adding it to their water. It will not change your pH reading(much). What it actually does is called molecular encapsulation and makes the nutrients and supplements available to the roots no matter what the pH(within reason) is. As long as your starting pH is between 4.0 and 8.0 you should be just fine.
Here's a key item as well that bears mentioning. In order for the pH Perfect tech to work properly:
When mixing with your water, add part A, mix and wait 5 minutes.
Add part B, mix and wait 5 minutes.
After this, you may add your supplements.