I did something very similar, believe it or not, training for a tough man contest when I was in law school. Damn thing hurt like a bitch for many years. I didn't start trying to do olympic lifts until last Fall, so learning the movements really taxed my wrist and shoulder flexibility to no end.
What I found worked for me was focusing on getting my elbows higher and higher. At first, I'd have someone stand in front of me, while the bar was on the rack and I've got the bar in the rack position and pull up on my elbows. Then I'd have them push down on my elbows and I would resist by pushing against their pressure. I'd repeat this exercise on training days and on non training days if I could find someone to do it for me (my wife loved to watch me squirm).
In addition to this, at the end of every training session, I'd put 225 on the bar and walk out with and hold it as long as I could in the rack position.
On top of that, I'd do a ton of stretches and yoga for both my arms and my shoulder girdle.
Lots more people here much more knowledgable than me. So I'd defer to them on this issue. I'm just speaking from my personal experience.
Good luck and go heavy.
All the best,