Potassium Issues

another question i have....
when i go to gh flora series drain to waste (http://generalhydroponics.com/site/gh/docs/feeding_sched/GH-FloraSeries-DTW-Charts.pdf) schedule it gives week 8 as 1ml(g)/4ml(m)/6ml(b) and gets around 500-700ppms with additives. when i go to gh calculator and add those rates in gallons the ppms only come out to under 300ppms. is there something i am missing? they are also recommending nute change only once a week so does that mean i should just feed pH water for the remaining days? i feel the chart is off for coco use.
 
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