Those are pretty common beneficial soil microbes in many inoculants I've used so I don't think that would lower your PH significantly to cause lock out of some nutrients.
Have you checked the PH of your soil or were you just guessing that might be a possibility?
Soft Rock Phosphate is a good amendment in moderation but it's better incorporated into the soil before planting instead of sitting on the top of the soil. Soft Rock Phosphate is largely insoluble and will be broken down by biological activity before the phosphate and calcium will be available to the plant over time. Just look at it as a slow release P and Ca fertilizer.
Just a thought but If you put too much on top of the soil it could be caking and causing problems with water penetration.
A better way to add it to the soil during the growing season is to mix a little with your water as colloidal suspension and water it in so the fine particles and the microbe spores too will penetrate deeper into the soil to the root zone. That's where the magic happens.
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