If the aim is to cut out the play acting then you just need to have the bar be "is this a reasonable response to the contact?" If the retrospective punishment is severe enough (I would suggest it be more severe than 3 games if you really want to...
You genuinely believe, having watched those incidents, there is a reasonable argument that they were hurt? Not a chance.
It's so clearly obvious to 99% of fans to see what is and isn't cheating, it shouldn't be difficult to go back an punish...
You could argue that by giving away a penalty from a corner (that is subsequently scored), we have conceded from that corner as we obviously did not do an effective job of defending it.