Help, what's going on with my outdoor grow?

Hey all, I was wondering if anybody had an idea with what's going on with my plants? Both Purple Punch, in 15 gallon fabric pots, Fox Farm Happy Frog soil, and GH Floranova Bloom. I was using water out of my faucet which I just found out the pH is really high in it. I'm watering every other day to every 3 days (depending how hot it is outside) with nutrient waterings every other watering day. My last watering I adjusted th pH and used over 4 gallons of nutrient solution per plants until I saw about 20% run off. The older leaves are light green, some with edges burning. They are placed around my pool. Any info would be greatly appreciated, this is my 1st out door grow.
Thanks, DG

Back off the flower nutes. Everything else look fine.

To me, it just looks like your plants are showing their age. They look reasonably healthy for that stage of flowering. Lots of plants start to shed older fan leaves as they get older and flowering progresses. Don't try anything drastic unless you know for certain that something has gone wrong. But if those were my plants, I would think they were performing up to legitimate expectations.

Thank you everyone for all the replies and advice. I'll take it easy on them. I also got a Wedding Cake plant that I think is in week 2 of flowering. She's been taking everything I'm throwing at her, but I think I'll ease up just incase.