And just to clarify the use of Ammonium Sulfate. It's not good to use in the beginning of the grow when the soil is loaded with raw nutes. Ammonium Sulfate adds N and S.
So if I ever bought soil (never gonna happen) that was 7.8 pH before planting, I would do an extensive acid flush with citric acid. It does not affect NPK or deposit metal into lungs. Then I would inoculate with lactobacillus for long term gradual acid production within the media.
There are many ways to inoculate with lacto, but most lacto is ill suited to ferment at 70-80F. That's why I would skip the crunchy bro approved "banana peel lacto ferment" or similar concoction and buy some lactobacillus plantarum which works well in the 70-80F range.