How to best make smooths holes on a column curved shape without pesky sharp edges

Hi there! I was just wondering if anyone had any advice on how I could improve this model so that the holes don’t leave these diagonal edges causing the face to not be smooth. I used Solid Tools to create the holes in the mesh.

I have attached a link to the file if anyone is interested in taking a peek at it in SketchUp itself.
the troublesome mesh.skp (312.4 KB)

Set the number of sides for the larger circle so an edge length doesn’t match the diameter of the holes. Here I’ve set the number of sides to 36. I also increased the number of sides for the holes to 24 although that wouldn’t be absolutely required. I also rotated the “pipe” so vertices are on axis and gave the pipe wall thickness before cutting the holes.

Wow that’s very helpful! Thank you Dave. Would you be willing to share the file with your changes so I can take a closer look at your changes?

Here you go.
the troublesome mesh.skp (470.4 KB)

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Thank you again!