Originally Posted by Team Sarcasm

That stinks, sorry for your shoulder and your bike. Hope you get better soon

As far as downsizing I am on a 56 and should be on a 58.

You definitely feel a sense of dominance over your bike
Steering is a little more twitchy (I feel in a good way)
if you like the position you're in now, you will have to show more seat tube and run a few spacers
Longer stem
I feel more confident on fast down hill descents because you have more control from the longer stem

One thing to check out would be knee clearance w/your head tube/back of stem/steerer tube. Out of the saddle riding/sprinting may give you an issue (like your knees hitting) I don't have this problem.

Overall, I am loving my downsized frame.