If your using a elos alk test kit then your alk is 14. Its .5 Dkh per drop. Not all that bad considering that your cal and mag are so low. Low cal and mag can cause this. Do not try to adjust for ph! only for alk. Once you have your alk at the right level your ph will find it's own natural balance. Slowly bring your cal and mag up to spec and leave the alk alone until it falls naturally. This may help
http://reefkeeping.com/issues/2006-06/rhf/index.php