I'd recommend 2.5 gallons of ultra bleach to get your chlorine to 15ppm, 2lbs CYA in a sock in the skimmer to get your CYA up a little under 20 as a starting point (it may take a few days for this to register), then about a cup and a half of muriatic acid to start lowering your pH. Check every thing again after it has had a chance to circulate for at least 4 or 5 hours and see where it stands before tweaking anything else. I think it's better to change things slowly when nothing is terribly out of range. Run the filter continuously for a few days.