simple test to see if the centering problem is the wheel or fork.
Take out the front wheel and flip it around and put it back into the the fork, if the wheel is now closer to the other blade of the fork - the problem is the wheel, if the wheel is still close to the same blade then the problem is the fork.
Take out the front wheel and flip it around and put it back into the the fork, if the wheel is now closer to the other blade of the fork - the problem is the wheel, if the wheel is still close to the same blade then the problem is the fork.