Yeah you need to bump up your light. Last I checked I had 500-600 par levels at the top center of my rocks. Most areas I had my sps were at least 300 par. More nutrients you have, more light your coral can take. I would increase slowly.
that depends on nutient levels. Typically higher nutrients can accept higher alk and vice versa. I run my alk typically between 7-9, but also have higher nutients.