Re-planting question?

My current soil consists of 2 part Promix BX to 1 part Foxfarm Ocean Forest with extra perlite mixed in. I have three plants currently in 1 gallon pots and I have already started given them organic teas a few times. I want to transplant them into 7 gallon contrainers. Do i mix in the foxfarm into the the 7 gallon containers? or do I just mix in promix with whats in the 1 gallon containers. I am just worried that with adding fresh Ocean forest that it will screw up my ph bad?? Can someone help me with this

Nothing wrong with FFOF,it's all I use.

Dabbling with coco hempy buckets now though.

FFOF has lime in it to buffer pH.

I usually do 1 part ffof and 1 part light warrior with extra perlite in it and works good for me. I go from 2 gallon pots to 5 gallon smart pots.