Can anyone help? Having bogging problems w my Kawasaki stx jetski?

It's a 97 stx 900. It was booging down, especially at low rpm when I hit the throttle. Starting stalling out. Once I got the rpm's up it runs flawless untill I let off the throttle, then back to square one. So I emptied old gas, changed fuel filter, and added carb cleaner additive. Seemed to start getting better, but not 100%. When I played with the choke a little, it would jump right up and go. So I really think it's the carbs. Is a rebuiled the only way out of this or does anyone have other suggestions? I'm not a mechanic and don't want to spend a whole bunch fixing it. Any help is appreciated, thanks