lower offset, not higher. lower it is, further out it sticks.

or wider wheels.

or proper bolt on spacers, as the slip on ones like you using are useless as like you say, you run out of thread.

you need ones along these lines...

http://www.driftworks.com/catalog/pr...-wheel-spacers

http://www.driftworks.com/catalog/pr...-wheel-spacers