i have the same issue with pie charts. my canvas is around 300px and the auto sizing of the radius makes the pie chart too small since the smart labels require so much space.
would be great if the smart labels were alittle "smarter" in that they tried to maximize the radius and move the labels above / below the chart (instead of trying to squeeze them horizontally) and just connect using the smart lines. there is usually more vertical whitespace that goes unused while the smart labels shrink the pie radius and only seem to take advantage of horizontal space.
