Hello Kevin,
Regarding your questions:
1) There is no way to prevent this in Rim mode. The only label mode that fits the pie chart (and its labels) within the panel bounds is SpiderNoOverlap.
2) You can set the following property:
series.DatalabelStyle.Visible = false;
In case there are individual data label styles in the DataLabelStyles data series - you have to either remove them or set the Visible property to false for each one of them.
Best Regards,
Nevron Support Team