"I'm probably 70 per cent, so I have to buckle down. I still have a lot of work to do but I am getting there," added Bolt. "This has helped because I haven't run a serious race all season. I could go faster because I'm not in the best of shape and I slipped at the start.
"I am hoping by Berlin I will be 100 per cent. I don't try to peak before and I try to work towards it race by race."
Bolt was only passed fit on Monday after he injured his foot in a car accident just over a fortnight ago.
But Bolt finished well ahead of Britain's Marlon Devonish, who ran 15.07, and said he would target further world records this year.
"You can always expect great things from me because I always go out there and perform at my best," he said.
