Maybe try and use PK 13/14. I usually run coco coir pro+.
Canna A+B, Cal-Mag, Blackstrap Molasses (A little additive), Epsom Salts and PK 13/14 for flower. I've had great results.
Also, I don't believe in flushing. It's just a myth. Unless you screw up really bad.. And I mean really bad.