Peat-based soils will lose their buffering after a couple of months. And an ingoing water ph of 6.0 is too low to begin with. For peat-based soils, a ph range of between 6.3 and 6.8 is recommended. If you wander outside of that range, you'll start locking-out the plants ability to uptake certain nutrients.

Do you make your own tea? How much molasses per gallon are you adding, and how often?