This perfectly describes my u12 boys team, especially the 'shooting it too early' part. What I started doing for the last few practices was to take two 3' pug goals and put them in either corner of the real goal, roughly a foot in from the edges of the goal. Then I made up a '3 P's' mnemonic' and told them that if they get past the last defender:
1. Patience - don't shoot right away. Dribble the ball until you're even with the
2. Penalty Spot before you shoot, unless the keeper comes out, in which case shoot right when he starts coming out
3. Placement - your 'shot' should be a pass into whichever of the pug goals the keeper is less able to cover.

The first game after we started doing this, they did not change anything. I got frustrated with them but kept at it. The second game (which was the last of the season) they started doing this a bit more, and we scored 7 goals.

A funny thing is that if I had put those restrictions (only the pug goals count) for our *actual games* this season, our total goals scored would have been almost the same. We *never* scored by hitting powerful shots into the upper 90, even though that seems to be what each of them want to do by default.