It is wrong to target a draw length. Like you found, draw lengths do not always come in even inches. Many years ago when I started shooting Hill style bows I was insistent on trying be with an inch of my recurve draw length. When talking with John Schulz, I found that my height and wing span were the same as his and he thought that I was trying over draw. I was getting left to right shooting errors. I switched to his draw length and my accuracy greatly improved. I was targeting a draw length that was too long for me.