It may sound controversial but I think your players need to be less competitive in matches to take the pressure off them – at least in the next couple of weeks. This is not probably what you were expecting me to say but from what I can gather the pressure of playing in front of a crowd of parents is too much pressure for them expecting to win. In training they are much more relaxed and will be more likely to play their natural game. What they need is for you to set them realistic targets they have more chance of meeting. I'm sure you've heard everyone saying "win the second half" when they are losing badly at half time.  Or try relaxing the competitive talk completely and talk about holding onto the ball for 20 seconds during the game as a win that week or 5 passes by the team. Something they can achieve. Make sure the players realise this is not a Cup Final and that the win is not the most important thing. They will learn far more from losing a game. Playing more matches at training between teams is also a good way to get the players used to the pressure they face in match play. Warm them up with a couple of 4v1s or 2s depending on the size of your squad to get them in the mood.