Well, i have no experience with 2XU wetsuits, but with my Blueseventy i have to put it on, then pull the neoprene up to my shoulders. I don't know what tight is to you, but for me and my swimming background, the tightest thing you can wear that does not rip is generally what you want.
You may want to check out other brands and try to get one that matches your body type, or just try pulling the material to your shoulders. I don't really think sleeveless is the best idea. for me, the sleeves are not that much of a problem.