In my experience adding lots of baking soda will raise your PH too much.
Just add a bit at a time to get it around 8 or higher. You can bump your magnesium up a bit too 1300-1500 is good.
You want to maintain consistence as that is the most important keep things stable. 
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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