I think the issue you are having keeping coral is due to your high nutrients.
You can absolutely use Red Sea coral pro and run your tank at a lower alk, as long as you have corals to consume the alk.
If you do a 20% water change with your alk at 8 and new water with alk at 11, you will wind up at 8.6.
80% x 8 = 6.4
20% x 11 =2.2
8.6
Look to your maintenance routine to keep your nutrients lower, here are some options to consider:
Add a filter sock or filter roller. Start a refugium or algae scrubber. Skim wet or add a better skimmer. Feed less.
Keep your routine constant.
You can absolutely use Red Sea coral pro and run your tank at a lower alk, as long as you have corals to consume the alk.
If you do a 20% water change with your alk at 8 and new water with alk at 11, you will wind up at 8.6.
80% x 8 = 6.4
20% x 11 =2.2
8.6
Look to your maintenance routine to keep your nutrients lower, here are some options to consider:
Add a filter sock or filter roller. Start a refugium or algae scrubber. Skim wet or add a better skimmer. Feed less.
Keep your routine constant.