Not to sound like a know it all, but i have a degree in organic chemistry and Microbiology is one of those sub classes to organic chemistry. Im guessing the recharge product you mean is this:
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So when the bacteria feed on the molasses they create acidic by products. Similar to how vinegar is made. The reason when you add this to your rez and the ph spikes up is because of the Kelp Extract that is present in the product. Kelp and seaweed extracts are very high on the PH scale, this is why if you tested any rooting stimulant with algae/kelp extract in it the PH can be as high as 10-13ph.
The reason recharge says the ph will stabilize is because the microbials create acidic by products from eating the molasses.
You are partially right though because that product contains a bacteria called B. Subtillus, without going to far into a chemistry lesson that Subtillus strain feeds on cellulose (your roots, organic material, and the kelp). When it consumes the kelp inside the recharge it creates enzymes called cellulase, and these enzymes help break down organic material, but the enzymes they create are high on a ph scale, thus over time both the kelp and the enzymes created from the breakdown will bump up your PH quite a lot.
Theres nothing you can do because its nature taking its course! This is why premium super soils add PH amendments to their soils. Those bacteria if used every watering DEFINITELY consumed all the organic material in your soil!
PHing the water fed in wont fix the PH issue long term!
You are going to have to amend the soil!
You can either feed with a high dose of molasses or the sulfur amendment like i mentioned before!