Gorilla Glue - First Ever Grow!

today was meant to be the day i flip but as my ppms and ph off run off are not correct i am waiting a couple of days to see if i can fix the issue before flipping week 7 - feeding 600-650ppms - PH 5.5 - Run off PPMS drop to 280-300 - PH rises to 7.1PH, in the morning i am going to try and feed with a higher concentrate of nutrient something like 750ppms with a ph of 5.5 and see if my run off ppms come out higher and continue to do so until i get them in a ideal range.. if that does not fix the problem or run off still comes out really low then i think i could have a salt build up in the medium therefore i am going to just flush with plain ph water to reset the medium, but as you can see my plant does not seem to be suffering anything to worry about really she seems happy but it would give me the piece of mind knowing my girl is within correct ppm/ec range for flower flip so i can up the light intensity also! question.? - anyone ever fed 3L-3.3L of water in 70/30 coco perlite to actually get the run off to start coming out the bottom off thats what im feeding every morning is this normal i did read online GG is a thirsty plant, if i was to pour 2L - 2.8L i wouldn't get any run off does this tell me shes thirsty for more LOL Happy Growing!