Washed out appearance

I often export my buildings projects from OBD to LumenRT to produce rendered images.

I can't seem to get crisp images like I see coming out of other software.

Initially the scene is too dark when first exported. If I increase the camera exposure to brighten the scene, it washes out the material.

I play with the sun settings and the material brightness to try to improve the scene brightness but it is very tedious and still can't get the desired result.

Am I missing something?

Using Lumen RT update 15