Wetsuit tight in the shoulders--bigger size or upgrade the suit?

The obvious response is hike up the suit in the crouch as much as possible to give more room in the shoulders.... assuming you did this:

More important is the shape and fit of the suit than the quality, brand or manufacturers's size.  All brands are made with different body proportions. Try other suits but don't limit it to more expensive suits.  Just because it costs more doesn't mean it will fit better.  Some fortunate people find very good fits with inexpensive suits.

It's the same as all the treads on bikes, fit is the most important aspect of a wetsuit.  It is just too bad wetsuits can't be adjusted like bikes can.

I have the same suit and the same problem. I assumed that the problem was how I put it on, but after a few tries with different techniques I rented a sleeveless.  Eventually I'm going to look to another brand that's cut differently. 

I'd be interested to hear if you find a full suit that accommodates your shoulders.

I was completely new to wetsuits.  Purchased an Xterra Vendetta (High end) and it seemed to fit really well.  But without any reference I was not really sure.  It was very tight but not unbearable.

I got a great deal on a Zoot Flash (low end).   Decided it would be nice to have a training wet suit.  Purchased and I just can not get one to fit.  Way too tight.  I do realize it should be very tight but this was not even in the ballpark.  I would say my build is lean.  I am 6 feet 160 pound right now.  I really wanted to make the Zoot work.