Go to http://www.garf.org
They have instructions for curing it. Don't try to rush it beyond that or you may end up with other problems down the road. Curing rock, live or artificial, is no different than trying to rush the Nitrogen cycle.
I wouldnt try to rush the cure time...as with anything else in this hobby...good things come to those who wait!!!I wouldnt risk sendin you pH off the charts just to cut a week of cure time!!! Go slow and be patient... Good Luck
Why are you lowering the PH? What level is it? I have done alot of things with my tank and I have never had to do anything but try to raise my PH.
My ph usually runs about 8.0 (should be 8.2-8.4)