Can't raise alkalinity enough?

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I would like to get my alkalinity up to 9-10 but I just can't seem to ever get it above 8 and hold it there. I dose with seachem? reef builder every 2 (sometimes 3) days the recommended amount (1/2 tsp for 33 gallon tank).

My calcium level is holding around 480-500 and I only dose it once about every 7-10 days.

My tank picture is below to give you an idea of what's in it. Are others using the reef builder and maintaining higher levels? Any suggestions what I should try to balance this calc/alk better or is it OK? My coraline growth has been fairly slow.

Also, my cabbage leather coral is nearly finished in the lower right, any suggestions that might help it would be great. It used to be higher up so I've tried to move it down now to lower the light intensity. 2x96W Coralife


Thanks for the help.