I haven't tried it yet, but did make the big star and found I had to re-size as well. I understand if you use starch when pressing it will help to keep the bias from stretching which is what I think caused some of my problem.

Good luck, hope someone else has a better or faster solution for you. BTW, I think Jenny uses a little "fatter" 1/4 inch seam so maybe that is why her blocks are smaller than yours.