Rapture, here's a thread (fingers crossed) that describes a persistant form of algae that takes hold this time of the year (at least in some locations) http://www.poolforum.com/pf2/showthread.php?t=5612
As Simmons said a couple of posts above, with that much chlorine in the water, the pH test is useless (Waterbear, I believe, addressed the chemistry side of why - something to do with high chlorine changing the scale of the test). Getting the algae completely removed from the pool should be the first concern, then you can play with the other perameters of your water once the cl levels have dropped to normal range.
Please give the thread I linked a read and see if it sounds like the stuff you have, if it is, follow the advice there for dealing with it, then we can get you back on track with your other chems.
Sorry I couldn't give you the 'magic answer' to your problem, but sometimes these things just take a little time, patience and perserverience- good luck, keep us posted - Waste
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