Convex Hull operation not specific enough

I have yield data as point values, and I simply want to create the boundary around this layer. I have used the Minimum Bounding Geometry tool and selected Convex Hull to do this, however it maintains the corners as part of the polygon. Is there a way to automatically keep just the boundary of this file? Pictures below.

Here's the point file:

Here's what Convex Hull gives me:

And here's what I need to automate:

Any help would be greatly appreciated!