They look great to me. Make smaller seam allowances for the sashing and you will be all set. For the next few, make your side pieces wider than your pattern calls for to give room to have a 1/4 seam allowance, maybe? It could be they are out of whack in the pattern.
I make all my test pieces pieces out of greens, aquas and blues and then put them all together in a "sampler of oops" quilt! Most people don't realize they are test patterns and i have a stack of color-coordianted quilts to keep me warm.