DanOratioXP, generally speaking if I feel any discomfort doing an exercise a certain way, I don't do it. It could be that your neck has limited range of motion which makes it feel strained in that position. You don't necessarily have to tuck your chin in; you could just tilt your head slightly forward so that you can achieve a higher peak contraction at the top. Just don't look straight up and have your neck pushed back in the way of your traps. Looking up tends to let you use more weight because your not using a full range of motion. If you want your traps to have full peaks, full contraction with full range of motion is the way to go. Like I said before, if an exercise gives you discomfort when you do it in a certain way don't do it in that manner. You have to find a groove that causes no discomfort while producing maximum effectiveness.
Anything worth having is never easy to achieve.