At your height and weight, I would suggest something stiffer. You'll be able to flex many park/ all-mountain skis just fine. Yes, 169 fpr your size is a bit small. YOu'll have much more stability with something bigger along a 179. Swing weight is just a tad more, but I guarantee you'll get used to it in a day or less.
For K2 sticks:
DOMAIN 179. Flat jib Rocker. Super stiff under the boot, but progressively softer tip and tail. Sick ski, but at your height and weight would be less forgiving if you land something backseat.
SIGHT 179. Snappy tail traditional flex with All-Terrain Rocker tip an tail. ABS sidewalls and thicks edges. This would be most similar flex to your Extremes, but with the easy swivel of Rocker.
RECOIL 179. More of a en even flex through the middle of the ski. Great center mounted and can take a beating.
Kung Fujas 179. It's wider at 102 underfoot, but many fo our athletes use it as their park ski.