I'm glad that results have improved! Also keep a look out for the match performance stats as well.
Would you recommend making it slightly more narrow to improve attacking potency or would the AP be the penetration and extra edge i need results have improved greatly i might add.
I wouldn't make it more narrow. Personally I don't like narrow play. Especially when Chelsea has such great wingers, it's good to have the play wide (but not extremely wide) which allows them more space to do their magic and get the opposition all hot and bothered. Ideally you want to retain the AP penetration through the middle, and ALSO have penetration coming in from the wings. This will wreck havoc on most opposition and is a joy to watch when you get it right.
I haven't played FM13 but a lot of people have been having problems with Away matches. So it might not just be purely a tactic thing but a inherent game engine problem. Not that you shouldn't be winning most matches away but not be too discouraged if your team has an occasional shocker away.
I'm not sure about the actual stats but from my actual real world observations Chelsea seems like a very exciting team but don't seem to have too many hard-working players. This is a problem because if I was managing, I would want a really dynamic, hard-working midfield for away games to give me extra defensive capacity.
I don't think it will help setting your formation to such a narrow play away from home. This won't make your wingers (Inside Forwards) very effective. I would keep the width a bit above the middle. I would definitely bring the defensive line down to what you have done (maybe I would have set it to a bit above the middle of the slider) but unless you bought in new CD I don't think Chelsea has the fastest of defenders so maybe what you've done with the defensive line is good. I wouldn't be afraid to set the style to "Control" and the strategy to something more "Balanced".
Playing away from home I would play either 4-3-2-1 (against lower table opposition) or 4-1-2-1 (against quality opposition). To give you an idea of the roles in my 3 man midfield i would have 1 AP (in the middle of the 3), 1 CM (support role) and 1 CM (Ball winning midfielder). It is important that both the CM support and Ball winning midfielder have to be hard-working, high teamwork players who are really prepared to work to get the ball back and do their share of defending.
If I was playing with a DM, he would be in quite a defensive role. Mostly sticking back, sweeping the field hopefully before my defenders need to deal with it.
BTW what sort of problems are you having away from home? Conceding or not being able to score goals?
Don't overlook the importance of physically strong players in the midfield as well. I'm thinking Fellani types who can really bully other players and get the ball back for your team.