Just checked the last couple of things I printed and I don't get 'waves' at the corners.
But then I've never messed with any of the printer's default print settings - other than switching acceleration on.

I also don't mess with them from simplify3d either.
Most problems are solved by filament temperature, print speed and keeping the machine clean and greased.
That said I've got the biog standard flashforge creator. And from what I've seen, it prints as well as machines costing many times as much.