If you do adjustments to your soil pH, you need to first determine the runoff value which is the combination of (what you put in) + (what the soil is doing to it) = (what comes out the other end). So if your water in is 7, look for the runoff pH to be about 6.7-6.9.
How are you determining soil pH? There is a sticky at the top of this section on how to do it correctly. Metal probe type 'soil pH meters' sold at garden stores are often WILDLY inaccurate, and at the very least, quite imprecise.