Okay, a top down raglan has incs every other row. Instead of knitting XX rows as in the pattern, use that as a basis, but not your final length. Try it on when you reach that point and see how it fits. The inc lines form the raglan 'seam' and the front and back lines should just about meet at your underarm. If they don't, do a few more rows; if they're too long, take out a few rows. Also making sure you have enough sts for your body and sleeves. Another way to calculate when to try it on is when the back sts measure half the finished bust measurement you want. Say you're aiming for 38" around - then when the back sts are 19" try it on, see if the yoke meets at the underarm at that point, if it's too long or too short. There's ways to adjust that. The main point is that she does say to try it on to get the right length for you.
So as long as your gauge isn't drastically off, you should be able to adjust the length of the yoke this way. Also, did you wash your swatches (you can do just one with different size needles btw) the way you will the sweater? That can sometimes relax the sts so your 14 sts may hit 16, which is a little closer. It may be your yarn is thinner, so you can try a larger size of the pattern. The pattern does mention how long to make the body, and the sleeves can be any length you want.