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I don't know about problem 1, but I has the same problem #2 (White Gap between 1st and 2nd Series). And found a workaround

I stared at drawItem on StackedXYAreaRenderer for a while and it looked like the base of each series was drawn from the series proceeding and hence the order to go through the series would be forward from 0 to n.

But the XYPlot drawItem iteration order default is REVERSE from n to 0.

So as a workaround I had luck by calling the following after creating the plot with the StackedXYAreaRenderer:

plot.setSeriesRenderingOrder(SeriesRenderingOrder.FORWARD);

And that seemed to solve the white gap problem.