For your arm, you need two things above all else (in addition to good technique): Heavy frame, and soft strings. For this reason, I would go with the six one 2012. This model is slightly more powerful than your BLX (2010) version, so that makes it the perfect racquet to use with a soft, low-powered multi like Rip control 16 or anything else you like.
Don't be fooled by the so-called ''control'' attribute of polys, they're much more powerful strings than most people say. And I find them too lively in this Wilson model.
The Head is not a bad choice either, and would be even softer for your arm. It's a bit less powerful than the Wilson, so you could also drop the tension, which is also good in your situation.
Didn't try the two others.
4.5 on a good day