I dont hand piece and i have heard somewhere that hand piecing doesnt require 1/4 seams so... was your pattern designed for hand piecing or does it require 1/4 seams? if it does go back and measure all your seams to see if you are taking out a little extra somewhere and either correct your mistakes (if you made any) or you can fudge alittle when you put it all together. Lord knows I have had to fudge on my share of seam allowances.