One other thing that has not been mentioned so far. If you have a block that is a tad bigger, it is easiest to ease if you put the larger block on the bottom. The feed dogs on your sewing machine will be a great help in easing in the fullness of the larger block.
You could also try laying your top on some plastic or some towels and dampening it with a spray bottle and then letting it dry before pressing again. That will sometimes allow fabrics which have become distorted from 'ironing' instead of 'pressing' to return closer to their original size.
I am not a great believer in starching or sizing. I want my fabrics to be as natural as possible. If they have a 'tendency' to stretch or shrink or whatever, I want to know about it before I cut my pieces, not after the quilt top is assembled. If you handle the fabric gently, it should not need any starch to keep its shape.
Last edited by GingerK; 09-03-2015 at 06:52 PM.