The scant 1/4 " is the secret to blocks going together neatly. Move your needle 2 clicks to the right. Makes a huge difference. On one of my machines I have a piece of masking tape which has been there for years and I use it as a guide. On my 6600 I use one of the marks on the plate. Try making a mark to use as a guide. You could also move your needle 2 clicks to the right.