I'm having this weird issue with the RadChartView when I try to use label rotation to try to improve label legibility, but it seems like a lot of space is being wasted. I'm only adding the following code:
Why don't you try to tweak the Margin property of the TextBlock inside your DataTemplate? Set it to negative value for the Top Margin and it will go up closer to the Horizontal Axis. We already have similar customizations in our online demos for example ChartView -> SmartLabels demo. You might see in code that we set the Top Margin to -2:
I have to confess the issue was on my side, my labels were being padded with spaces on the right (instead of "some code" i had "some code "), so all I did was to add a converter that trimmed this text and the issue is now fixed. Thanks for the answer.