that is a crazy formation, but probably overwhelmed the defense. A bit like madrid and others who bomb backs forward. just have to have some real mobile defenders who can cover some space. makes sense you have to bomb it due to the alternative of making a mistake and players getting behind you. i would have adjust that to not just bomb it, but to hit areas of play. Our backs get forward as well but as pressure comes you either find someone who suppose to be an outlet, or if he is covered, to hit down the line - away from keeper. this way you draw defenders out and you have a good probability of keeping the ball on your side of the field. most kids wont have the leg to get it across the field to the opposite corner. those who tend to try it get the ball intercepted down the middle (counter) or it will end up in the keeper's hands (or they are high enough to sweep it out). you have to have some quick kids to play what you guys did, one of our teams was able to play a V (one defender sweeping everything) most games because we had a very talented-aggressive back who could get sideline-to-sideline. allowed us to get numbers forward and could switch the ball around quickly - most teams will follow the ball like mice follow cheese. they over-commit and will leave the other side open. if you have a bunch of passing options can hit open holes quickly. why its important to teach kids less of the "BE AGGRESSIVE" 100% of the time and be disciplined in order to keep your shape on the defensive side.
looks like you were lucky on how you were taught to play. see a ton of kids and teams that are not that lucky.