Anyone have thoughts on this?
Are these WHDLoad versions or the original disks? I haven't ever tried those particular games, but it's not totally inconceivable that the joystick movement code in those games may not be suitable for fast processors. Having said this, they are not early Amiga games though, so this is unlikely. Also, I don't think I've ever experienced this problem before on an Amiga game. You could try slowing your machine down by disabling caches and so on and then try running the games to see if there's any difference.