You would have to really change your sizes if the block is anything but plain squares. Even then you may have to. I don't understand why your seams are pulling out at 1/4". Is your stitch length too long? Are you using regular quilting cotton? If you can, post pictures of your seams (from the wrong side) that show the stitch and the seam allowance.
I'm guessing nearly 99% of the quilting world uses a 1/4" seam and so far, I haven't heard of any problems with seams pulling out. Your quilting experience will be a lot simpler if you can figure out what the problem is and try to use 1/4" (and better yet, scant 1/4") seams.