The jets are actually a small stainless steel ball in a socket which makes them adjustable. Have the dealer take a look at it and adjust them if necessary.
I find the jets on mine are set just about perfect from the factory. I did however re-aim one of them to better cover passenger side windshield as there was always a smear in the middle. BTW, I used a thin piece of stainless steel wire inserted into the jet. A paper clip might work too if it's not too flexible.
Refer to the service manual, section WW, page WW-87 for more information:
http://www.nicoclub.com/FSM/Rogue/2008/