Yes The elemental sulfur method you are looking at takes time, months and is mainly beneficial if used preplanned ahead of time for major drops in ph like the 4.5 that blue berries like... it is a bacteriological process of conversion to sulfuric acid and It is not instant*. Should the PH Down, for some reason, not balance you out, then aluminum sulfate would give you quicker results but has the danger of aluminum toxicity without known dosage to administer..
The fewer additives, the easier to diagnose if things go south.
For the future, when ready to re-up on nutes, take a look at the Advanced Nutrient Sensei line. They are PH perfect and takes the whole PH issue away in general. Using Tangs lite schedule, [HASHTAG]#2[/HASHTAG] below has sure upped my game. My ph pen quit last year and I don't even miss it. I'm not expert, just reading as I type.
*
http://msue.anr.msu.edu/uploads/files/Lowering_Soil_pH_with_Sulfur.pdf
[HASHTAG]#2[/HASHTAG]
https://www.autoflower.org/threads/tangs-easy-auto-feeding-schedule.47290/