1/4” will work fine Barb. You will probably just find yourself backing out of some cuts because it won’t make the turn in sharp corners. You’re well on your way to becoming a pro at these boxes so you’ll get the feel for it. Knowing you did that with a blade wider than 1/4” makes it more impressive! Something else to consider is that usually the smaller the blade, the narrower the kerf. So you get less gap.