I'm dosing only at water changes, half strength only. WC are once a week to once a fortnight, depending on my mood -
I find dosing full strength gives me algae bloom - to be honest, I'm only dosing as it is said to be the done thing. However all my plants seem to growing at high rates, even when I don't dose at all. High light and CO2 sure do take care of most of it I think!