1st Grow Ever

Lesson learned last week, underfeeding is bad. I think I underfed and shifted to flowering nutes too late. All plants seemed to be suffering from P deficiency maybe low calcium too. I am still not too good at reading leaves. PH control is good. I am adjusting feed/water to 6.3-6.5PH, effluent water is 6.2-6.5 so I think any issues due to messed up PH are behind me. I think feeding and then not feeding for one or two waterings may not have been ideal. I believe the same food spread out all the time is better, getting the plants a constant supply of food. Instead of 10ml/gal in one feeding, than none in the next, 5ml/gal continually would seem to make more sense. Sadly due to trimming most of the fan leaves that were damaged from the PH issues weeks ago, when the nutrient deficiency hit the upper leaves suffered, or due to an immobile nutrient deficiency, now way to tell now. Mon - Fed with nutes per schedule at 6.4-6.5PH. Wed - Fed with nutes per schedule at 6.5-6.6PH. Thur- Hard to tell but plants seem to be still suffering from nute issues. I noticed yesterday that the effluent water was low, at about 6.0. Maybe the issue is PH problems with the soil again. Will not feed on next water with just 7.0 PH adjusted water and check effluent again. Fri - water only, adjusted to 6.9PH, checked runoff PH and PPM. One plant was a bit low at 6.4 which leads me to believe that one could be suffering from PH lockout. The PPMs of runoff were all a bit high (water in at 350ppm). I was 650, 950, 950 and 1250. I think I will flush on next watering to get that down. Sun - Fed with nutes (10ml/gal Terra Flores, 10ml/gal Cannazym, 10ml/gal Boost) pH'd to 6.0. Talked with my local grow shop guy, I may have been PH'ing my feed water wrong. I was aiming for 6.8 as from what I have read that is the proper PH for soil. However, according to the Canna schedule I should be shooting for 5.8 to 6.2. Seems counter-intuitive, but this is my first grow so lets see how it goes.