Bubba kush strain

I have two Bubba kush been giving them water at ph level of 6.3 just transplanted them to 2.5 gallon pots there about in second week of flower wondering what's the best ph level for them there outdoor in Fox farm ocean forest and about how much water should I give cuz before I had them in .5 gallon pots so it's a big difference can anyone help thank-you
 
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