If it bothers you enough, cheat - put in folds to make as close an approximation to the sett as possible, but making more pleats. The inside might reveal the strategy, with the pleats being different sizes - but it is a commonly used strategy when using a large sett, and not at all obvious.

Some tartans, when pleated to stripe, use alternating stripes for the same reason - one is called ketchup and mustard, as the stripes alternate red and yellow.

Anne the Pleater