hey man when you feed in soil your looking for 10% run off. hydro typically is higher than soil. ph between 5.8 -6.5 is ideal (hydro) starting at the low end during veg and graduate upwards to flowering as the plants flower and are starved for nitrogen it makes sense to increase p.h to optimum...
need quick short term fix for p.h up. Ebb n flow and using r.o h2o and coco. Any ill effects using baking soda given the head room due to the r.o ppm @ 7 (if that). Would it necessitate the elimination of any calcium supplementation