Stevo - might be worth reducing the amount you feed for a couple of weeks and reassessing as the softer stools are often from overfeeding.
Sags
Problem is he doesn't really look like he could do with less food...if anything quite the oppsite really. I wouldn't say he's too skinny...infact he's probably perfectly dimensioned. Currently I'm feeding him 1 cup of Artemis three times a day...with the occasional pigs ear or liver treat as a snack, but not everyday.
Is that too much do you think??