Hi there for your height and also "flat water" in the Gorge, presume you would want the straps a bit closer together - try second hole from the back on the front strap inserts, second hole from the front on the back strap inserts. Good luck, you can also play with the fins for more control/speed - back should be a bit better for the Gorge, fwd better for waves - but start in the middle, same for the mast track, then play a bit in small increments of max 1cm. Good luck!