What setting causes the corners to stick out more? Too much junction deviation?
Best I can tell, it comes from loose belts or slop in the bearings. Something I am currently trying to solve. 
A couple of causes, most likely software/stepping, but over extrusion can cause minor bulging at corners. Matter hackers has a great visual guide, also your printer manufacturer/firmware board developer may have specific tweaks/checks
Several possible causes. Aside from those already mentioned above you can also get this effect from buffer starvation issues. There is a slight pause at direction changes leaving a bulge at corners. It shows up most prominently on curves if it is an issue.
May be the acceleration settings.
That kind of bulging is very often a suboptimal acceleration tune. Jerk too low can do it. I honestly don’t understand junction deviation well, but I think increasing it can help. What’s going on is the extruder has built-up pressure and it’s oozing out as it slows down for corners. Some firmwares dial back the pressure in advance of a corner to help reduce this effect.
Thanks for all the help guys, I have turned up the acceleration and slowed the outside perimeter. Seems to have solved it.