I also felt that the team moved to more of a 352 formation in the second half which certainly helped the play and I agree we always look and play better with that extra man in the middle of the park. It's 433 or 352 for me, that 343 sacrifices too much in midfield.
I think the main problem offensively is a complete lack of balance. Arsenal need to replicate what Ox does on the right hand side on the left and unfortunately we simply do not have the personnel.
I think it's only a matter of time until it clicks. Allot of it depends on Özil and Alexis working out how to play as two number 10s as that is essentially what we are playing them as. There are signs of it functioning, just not consistently enough. They also need a centre forward ahead of them with good movement and that isn't one of Welbecks strengths.
We are playing a wing back system with only one dynamic wing back and two number 10s who have a striker who lacks movement to profit off the creativity of the two 10s and the crossing of the wide players.
Imagine something like:
--------------------------Cech
-----------Mustafi--Kos---Monreal
OX----Ramsey------Xhaka-----Lemar
---------------Özil---------Alexis
----------------------Belotti
You've got Ox and Lemar as offensive wing backs with pace and power like Juventus. You have wing backs who can cross a ball from both flanks. You have a midfielder in Xhaka who can spray passes to the wing backs to get them in a 1v1. You have a centre forward who is excellent in the air for crosses. Someone who can poach in the area, fast on the break and also with the movement to profit off of Alexis and Özil. You also have two centre backs who are comfortable with defending in wide areas and covering the wing backs.
If we had a player next to Xhaka who was simply better than Ramsey I think that team would be potent. I like what Ramsey does but he will always have limitations.
I'd like cm next to Xhaka who has the same engine as Ramsey but more recovery pace to compensate for Xhakas lack of pace. I'd like the player to have the same forward off the ball movement and goal scoring potential. Most importantly I'd like them to move the ball quicker and be more technically adept. Put someone like Tielsmans in there and you probably get that. However that's asking for too much as Wenger loves Ramsey.