Splitting in even portions throughout the day will keep blood levels steady.
I think the extra motivation of knowing you took a pre-workout dbol is responsible for that "extra kick."
It definitely kicks in quick. I made the mistake one time of taking 15 mg at bed time. I had energy and could not sleep at all. My libido shot through the roof. I spent most of the night masturbating to internet porn.
so you can take it whenever and it will help you.. i take it 3X a day.. 10mg each. you don't have to take it before a workout, it does its job on its own to grow you.
and the water retention is important to protect your body when you are lifting from injury. its the bodies way of creating a cushion. so if you are gonna do hard lifting its not always a good idea to take things to limit your bloating. JMHO.