If 7.7 is your end goal for alk then I guess change salts otherwise stick to a salt who’s parameters match where you want your tank to be. New focus is stability so no need to change salts to bring down parameters quicker, you’ve got plenty of time for those to lower with your routine now.
I’m assuming the top graph is nitrates in ppm? If so you’re in that sweet spot of 2-5ppm a lot of people shoot for. Phosphate may be considered high by some, before you started bringing them down with water changes but won’t be detrimental to coral health
Good plan going to weekly water changes.
What is your plan for nutrient export going forward?