you could just continue to use your promix and add your ferts.

I really liked the promix, it's quality soil.

Actually because fox farms ocean forest is so expensive I do a 50/50 mix of promix and fox farms.

I think it worked out well for me.

I use age old grow organic fertilizer for veg, I haven't picked up anything for flowering yet, but I'll get something tomorrow.

I think you could get away with promix the entire grow.