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I'm not too keen on the knock prone rule. It shouts to the players MINION (which is also something I do not like about how the core rules can be used).
For me, the problem is not just that they are so easy to kill, but also that the PCs are quickly given meta-gaming information that a foe is a minion and hence, they change their tactics accordingly.
This gives me an idea that I might implement. Schroedinger's Minions
So let's say I want the PC's to fight 8 bad guys. 4 are Soldiers and 4 are Minions. But when I put them out there I don't use different minis for the two types (or describe them differently if not using minis). They are all presented as simply "bad guys".
When a PC hits on then I roll on the spot an odd/even die that determines if that bad guy is a minion. If so then he's killed immediately (or bloodied if I'm using my own Tough Minion rule). If not then I just mark him as a Soldier and note the damage. Once I've determined that 4 are either Soldiers or Minions then I don't need to roll the odd/even die anymore.
Seems like this would reduce the metagame aspect of minions in some cases. I wouldn't use this for every single fight. There are plenty of situations where I think it's fine to broadcast which enemies are minions and which are not ("You see the Evil Wizard and his Hobgoblin Bodyguards by his side. Standing in front of them is a rabble of ill equipped goblins...").