Hey Ando , try putting some dishwasher liquid in your mix , sometimes clovers and other waxy weeds the poison doesn’t stick well so a wetting agent is required. Also spraying too early in the season , whilst it’s still too cold for good grass growth allows weeds to regerminate . Bindis can sometimes need a second hit .
I mix a good squirt of dish washing liquid and I use a marking dye as well...
I do get good kill rate I suppose....its just they grow again right beside the dead one... its like as soon as i kill one....two appear in its place !!
I think I started spraying to early in the season... as you said