I echo as mentioned above. Slowly dose to your ideal alkalinity, then do some daily testing to find out what the consumption of alk is. From there you should be able to figure out your tanks consumption and dose accordingly for your first deal parameter.
You mention your lower on the nutrients side, so I would consider keeping alk around the 8 mark. Also depending on how much you need to dose daily, I would recommend splitting up the dosages as previously mentioned. The goal is to have as stable parameters as you can so the corals can adjust and now be shocked.
Looking forward to seeing more photos as everything levels out
