Regarding the Axis Label positioning, this is the expected appearance on iOS for that axis type. For more details refer to the iOS TKChart LineSeries.
Native Android and iOS charts are two different controls and do not have 100% appearance-matching across all the platforms. In this case if you want to have extra customization on the chart control, you should create a custom renderer for each platform. For more details about how to create custom renderer please take a look at our documentation: Chart Renderer.
I have attached a sample that shows how to achieve this for iOS. Please take a look at the CustomChartRederer.cs file inside the iOS project.
Please review the sample and let me know whether it works for you.
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