I think that's my favorite of the 4-3-3 formations I've used so far. I love that midfield triangle for holding possession. The only problem was that the bronze team I used it with didn't have good enough shooting from the CMs (who ended up getting lots of shots from just outside the box on layoffs).
How do you have ur player instructions set in the 4-3-3? I typically have striker set as Target Man, Press defensive line, stay central. I like my left wing to be inverted (right footed) and given instructions to cut in, with the LB "always overlap" and he becomes the second forward, while the FB overlaps to play the true wing. Then on the right I try to have a right footed winger with "stay wide" as a true wing player with the fullback on that side set to defensive (and more defensive oriented in general). CDM set as defensive as well, that usually gives me 4 players back in case of counters, even if the LB gets forward. Your LW would fit my system perfectly because he's right footed and he's also got 4 star weak foot, so he can cut in and shoot and also cross with either foot.
I like Biglia a lot as a complete midfielder playing CDM (I'm playing the 442 with CDMs) but give this guy a shot as well, he's got really good control and passing and he's also got a nice long shot (left footed) that can catch people off guard. I feel like having a good technical holding mid really makes a difference this year.
http://www.futhead.com/17/players/15108/miguel-veloso/