Yes I too did this... taking clones from flowering... and man they are rooting much slower then the rest... Whats wierd is I was just begining to flower and the branchs I took had NO hairs... and now.. even under 24/0 they have hairs... but no roots.. should have em in a couple days though.... I hope

On the ST I just bought it today and will start using it regulary

A test I thought about was to maybe break 2 plants in half... or down the middle try one with ST and one with out.. if you have enough clones it shouldnt be too much of a loss