gambella is a pretty interesting bean and has some of the characteristics you have described. It doesnt need to be roasted very dark, also dont stress too much when it roasts uneven. You may struggle to replicate the roasts Dibella they have many more tools and r+d at their disposal. My tip is to enjoy your coffee for its variety rather then trying to nail down a specific taste. In time you will learn what coffees/roast depths you like.