When you say you only flush for one week, two times a day, does that mean the tank fills up with water and drains out two times a day?Clearex solution is the most popular brand people use on RIU to flush their plants.
The chart is just a general guide to get you going. I just used it as reference for nutrient concentrations. Depending on your strain it might take a couple more weeks than the chart indicates.
You can never go wrong with checking the trichomes to inicate when to start flushing. With fox farm nutrients I only flush for one week 2 cycles a day. Most people on here do it for 2 weeks. You just have to experiment yourself and learn from that.
Good luck