I mix my ff the same way, also using solubles and molasses. 4 gallons at a time, never had a problem. I don't even start at 1/4 strength. 3/4 then right to full. May depend on strain.
looking good norcal...bottom row p[ics are my fav sum really nice buds mate how long into flower are they again..
do you know that waters TDS reading with that feed in it?