Well, usually plants recover from that kind of a small burn, so I guess the EC is just a little high, but they seem to not have problems with it...
The best you can for your plants is to give them your love and try to understand them. Leaves are looking pretty healthy, so I guess the CC's have no problems with slight overfeeding.
As for the Juice and the PK - I donno, friend. I've never used that kind of style and as Tommy said, you should just follow the instructions given by the manufacturer... I've also heard that the PK is a one-time thing, but I guess there are variations... For the next time, try giving your plants half-strength or a bit higher dose, but still under the recommended, if you want. Some people like feeding all the way through until 1-2 weeks before harvest, some people like me, prefer to feed two or three times and then give plain water and repeat until 2 weeks before harvest - it's your choice, tarik.
All in all, plants are looking stellar and I hope you have a very successful harvest, mate!
Peace and Blessings.