Highcharts columns data overlapped

Question

I would like to show a chart in column type but when a value is larger than others, values are not really shown (here 450 €): http://jsfiddle.net/gyeb3fg2/2/

plotOptions: {
        column: {
            stacking: 'percent',
            dataLabels: {
                formatter: function () {
                  return this.y + ' €';
                },
                style: {
                  textShadow: '0 0 0 black'
                },
                crop: false,
                allowOverlap:true,
                verticalAlign:'middle'
            },
            borderWidth: 0
        }
    },
    series: [{},
     {
        name: 'John',
        data:[8000,8000,8000,8000,8000] ,
         dataLabels: {
            enabled: true
          }
    }, {
        name: 'Jane',
        data: [450,450,450,450,450],
         dataLabels: {
            enabled: true
          }
    }, {
        name: 'Joe',
        data: [187500, 150000, 125000, 100000, 87500],
         dataLabels: {
            enabled: true
          }
    }]

i've tried to add a 'minPointLength' to PlotOptions#Column (to show label and value) , but with a 'large' value, column are overlapped like this : http://jsfiddle.net/gyeb3fg2/3/

column: {
            stacking: 'percent',
            dataLabels: {
                formatter: function () {
                  return this.y + ' €';
                },
                style: {
                  textShadow: '0 0 0 black'
                },
                crop: false,
                allowOverlap:true,
                verticalAlign:'middle'
            },
            borderWidth: 0,
            minPointLength:10
        }

with 'minPointLength' to 10, values are shown, but labels are overlapped. (allowOverlap:true because i would like to show labels but to false, all labels are not shown :/ )

with this series (this is an extreme case but a real case), i would like to show all values and labels with a minimal length), any ideas ?

thanks

sorry for my bad english