Look and see if the jet is turning more to the left than the right. If it is, it sounds like your steering isn't "centered" Set the jet strait, center the rack unit and adjust cable to hook up to the jet with everything centered.
I hope this helps.
When the steering wheel is maxed out left and right, does the nozzle appear to be ....... how do I say this, equal, in other words when your maxed out does it look like the boat will turn a tighter radius one way or the other? If so sounds like you may need a longer or shorter steering extention. I dunno??? Edit looks like carrera dude and I were posting at the same time.
As has been said, it sounds like you're bottoming out the rack in one direction, likely due to misadjustment. Since the JE pump uses a different steering connection than the JC/JG type, it would help if you could post a pic of the cable side of your pump.