Yes, getting a flat bottom is the main advantage of a real trencher. I looked at renting, but the ones in this town are huge, and I have some tight spaces. The Home Depot doesn't rent here. Besides, I like the idea of having my own tool without having to be under a deadline to return an item.
This was a pretty expensive little trencher, so I'm gonna do my best to make it work. I have a winch coming soon. I won't be doing any more hand-pulling this thing. It's about 240lb - well in excess of me.