While playing through the SACs, and being annoyed about people using corner deployments, I figured out what feels so wrong about them: If you use a formation (eg: tank in front, artillery behind, flankers to the side), then the corner guys will run into your flankers first, kill them off, and then distribute their fire between your two lines. While I was busy shouting at my guys for breaking formation, I realised that they actually did not. They held a formation, but not correctly. Instead of keeping a position relative to the leading ship including its orientation, they just assumed that they had to be “left”, even if the leading ship turned around. Now this cannot be right, in real life, formations do not work that way. A fix for this would also really take out the oomph of cheap corner deployments. As it is right now, corners are a lot better, since they work against center AND far-corner deployments well and (can) have problems against same-corner ones, whereas center deployments usually suffer from anything except center.
You can take a look at this on my Flanking Demonstration vs some of the SACs with corner-deployment.