Using vegamatrix the two largest plants ph 6.8 and 7.1 just about 4 weeks into flower

Should i just flush with pryme zymes and hykreations folic acid or should i do thst with earth crystal ph down? It is time to flush anyways.
About 4 weeks into flower. I water every 2 days so far. Have been wondering if i should repot also. When i transplanted them they were in 1 gallon too rooted into 2 gallon switched to flower.