H2ok9

Hello, I am a female water skier just now learning the full course ('am consistent on min-course). I ski at 26mph, am 5'9, 155lbs (geez, that's a lot of personal info). I currently have a women's carbon onmi 65" in which I am "technically" five pounds over. I love how it turns, and my instructor says I get great angle, but I struggle behind the boat to get enough width (without the double pull!) to make the orange balls. My question, is it better to have a slightly too small of a ski, or potentially too long of a ski. Omni does not come in a 66", thus next size up would be the 67" (I'd like to stay with the Omni if possible).