Is there is a way to round off the area points and make them less pointed when used in the polar chart?

I have tried the 'areaspline', but with polar chart it's not quite right, as you can see here: 

<http://jsfiddle.net/qwbu6r3t/2/>

```
Highcharts.chart('container', {

    chart: {
        polar: true
    },

    title: {
        text: 'Highcharts Polar Chart'
    },

    pane: {
        startAngle: 0,
        endAngle: 360
    },

    xAxis: {
        tickInterval: 45,
        min: 0,
        max: 360,
        labels: {
            formatter: function () {
                return this.value + '°';
            }
        }
    },

    yAxis: {
        min: 0
    },

    plotOptions: {
        series: {
            pointStart: 0,
            pointInterval: 45
        }
    },

    series: [{
        type: 'areaspline',
        name: 'Area spline',
        data: [1, 2, 3, 4, 5, 6, 7, 8]
    }, {
        type: 'area',
        name: 'Area',
        data: [1, 8, 2, 7, 3, 6, 4, 5]
    }]
});

```

**EDIT**

[What I need](https://i.stack.imgur.com/27RV3.png)