If you're 175lbs and the kite drops in the power zone, just sheet the bar out and steer the kite diagonally and upward to the edge of the window to one side. This way the kite won't steer straight upward, lifing you off the ground. It will go kinda sideways, allowing you to keep your feet in front of you on the ground, sliding forward, so you still have some control. Another thing I did was I used to lie on my back and fly it. I would dive it slightly, then a bit more, then more, then harder still, until I got used to the pull and the kite was pulling me up onto my feet, but then not pulling much harder so I would be standing at the end of the power stroke. This helps you learn to get up on the board. Plus, if you're lying on your back and the wind gusts, you have a little breathing room where the kite has to first pull you up, then on your feet, then forward on your stomach, for you to get dragged. Gives you a little lee-way. Just do small moves first. Then as you get used to it, give the kite more room to work and generate more power. But in 8-12kts, at 175lbs, with a 13m bomba, you will be plenty fine. If it gets over 15mph (14kts), you should think about putting it down depending on your comfort level.
On the water, you're probably going to need 16-18kts, or more, to get up on the board. But admittedly, I'm not too familiar with the Bombas and how much power they generate. Have someone hold your harness when you launch, as well.