As stitch678 commented, stencils are seldom the size you really need--or they don't trace the exact size. There is something we quilters use called "the fudge factor". Make it work! You may have to adjust the stencil to the size needed--maybe doing the quilting inside or outside the marking will work. Sometimes moving the stencil half a design will work. I usually center the design I want and move from there. And quite honestly, unless you are entering this in a contest of any sort or using it as a wall hanging where scrutiny can happen, once this is on a bed, discrepancies won't be noticed from that famous galloping horse! Your rope design might be more difficult to adjust but the one 'stitch' suggested is easy to utilize for size adjustments. Congratulations on being a hand quilter--very rewarding!