I know i am new to autopots and growing in general but i have to disagree with that theory now even though i never put alot hydroton in the bottom,its all about the roots bro if your plants are big enough when you turn the pots on there will be no problem at all.i have seen with yours and meefs you had slow growth with your girls to start so the roots were not established enough when the pots got turned on so the wicking through the roots was a struggle.i read a thread from a guy who has been using the autopots for 10 years and fills his pots half way with hydroton and never has problems because he leaves his girls at least 3 weeks(or 12 inch high)before turning the pots on.i will try this next grow to prove or disprove this.