Crushing blows only come from mobs 4 levels or more above you (was previously 3) so this is no longer a concern. With that said, aim for gear with Strength/Stamina/Defense/Avoidance stats with Defense being a priority untill you reach uncrittable status at 80. Unfortunately, I have no idea what that number is.

Edit: Did some searching and 540 appears to be the new defense goal.