I use FFOF @jusgettinby. One plant is 6.1 in 6.5 out and the other is 6.4 in 6.5 out it all depends on strain, etc but you shouldnt be putting in 6.8 and getting 5.9 out I would suspect.
My PPM on just a watering day is about 350 in 1150 out (roughly).
when you say 111 and 152 is that 1110 and 1520? That would make more sense.