I grow my breeding stock in partial sun - I'm guessing that full sun in summer would be too much for them. What you need to watch out for on Sauromatum is mites - they love these plants for breakfast, lunch and dinner. I don't have that problem with my Typhoniums, which are similar to Sauromatum, as you know., Evan.
As for habitat, one must remember that in the tropics, "full sun" may be more like what we would call "partial sun" due to the intermittent cloud cover and sporadic showers. South Florida full sun can be brutal, intense and unrelenting, which is a recipe for plant cooking if they are not from a place that has similar 'full sun".
