I think she hit a hot bit in the mud Jimbo. I was loading them up at 4ml/L too just so they had plenty for them 1st 2 weeks of flower.
They're at 4ml in 1.5L of water now with 0.5ml of green sensation and are happy and chugging along.
Cuts from both plants rooted nice in a week and a bit, so I'll keep one of each and if they're anygood I got a couple of new mums for the future.