Testing space between labels of a polar chart and the chart itself

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/highcharts-more.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 310px; max-width: 400px; height: 400px; margin: 0 auto"></div>

JavaScript

$(function () {

        var data = [{
            name: "Label 1",
            y: 10,
            color: "#9fe642"
        }, {
            name: "Long Label Line",
            y: 10,
            color: "#274ffb"
        }, {
            name: "Label 3",
            y: 10,
            color: "#705ba4"
        }, {
            name: "Four Word Line Label",
            y: 10,
            color: "#a54593"
        }, {
            name: "Label 5",
            y: 5,
            color: "#d1d700"
        }, {
            name: "Label 6",
            y: 10,
            color: "#06675e"
        }, {
            name: "Label 7",
            y: 10,
            color: "#30ff8c"
        }, {
            name: "Label 8",
            y: 10,
            color: "#443c5c"
        }
    ]

    var borderWidth = 4;
    
    $('#container').highcharts({

	        chart: {
	            polar: true,
	            backgroundColor: 'transparent',
	            plotBorderWidth: null,
				margin: [0, 0, 0, 0],
				spacingTop: 0,
				spacingBottom: 0,
				spacingLeft: 0,
				spacingRight: 0
	        },

			title:{
				text:''
			},

			subTitle:{
				text:''
			},

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

	        legend: {
	        	enabled: false
	        },

	        xAxis: {
				tickInterval: 45,
				min: 0,
				max: 360,
				lineWidth: 0,
				minorGridLineWidth: 0,
				gridLineColor: 'transparent',
				labels: {
				   enabled: false
				},
	        },

	        yAxis: {
	            min: 0,
				lineWidth: 0,
				minorGridLineWidth: 0,
				gridLineColor: 'transparent',
				labels: {
				   enabled: false
				},
			plotBands: [ { from: 8, to: 15, color: '#FFFFFF', zIndex: 5 } ]
	        },

	        plotOptions: {
	            series: {
	                pointStart: 0,
	                pointInterval: 45,
	                pointPlacement: 'between',
	                states: {
		                hover: {
		                    enabled: true
		       ...