Your PH is high because the plaster is curing. You want to keep the PH below 7.8 otherwise you will get scaling on your pool and equipment. Search the forum for the bleach calculator Mike made, and it will tell you how much acid you need to add to get your PH down. My understanding is that you will need to add acid pretty regularly until the plaster cures (60 days?).
You will need to post your CYA level before your clorine problem can be commented on.
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