Read through the build early on and then again today. Bummer that your investment hasn't provided any returns yet but its only a matter of time if you can hang in there. Its disappointing that the wait is due to the rock and PH issues. Do you know for sure that the PH will even drop to safe levels in the future? Would be a shame if you keep waiting and waiting for something that won't happen - or won't happen for a long long time.
Also was wondering if you have plans for a new sump tank (maybe I missed it). Do you plan on enclosing the stand to hide the sump? If not perhaps building a custom sump with a large refugeium towards the front would be an idea? I built my own acrylic sump tank (albeit only 40 gallons) with multiple chambers which was a fun experience - perhaps that would give you something to do while you wait for the PH?
Anyway, impressive undertaking - lots of courage for sure.