I made the leap as a small female paddler (150lbs) to paddle the large burn and am really happy I have. It definitely requires commitment and aggressive paddling, but gives a lot of confidence and stability because its not loaded down to the max. Along these lines the boat rides higher so te edges don't catch as much when you don't want them to, however they are very responsive when you commit to using them.
Being small in this boat really works on making you use you edge, if you don't there is no hope of controlling it, and forces you to become really aggressive.
The downside to being small in the boat is that I do find it harder to roll, but my bigger issue is I find it a lot more challenging to boof.
That being said I am very happy with the large and the extra confidence from it. When I start wondering whether I should have gone with the medium I remind myself that based on gallons (80 gallons) it's not such a huge boat