Baked shadow artifacts [images provided]

After baking a single directional light in to my scene I seem to be getting these shadow artifacts on certain vertical surfaces. I’ve done a lot of reading/troubleshooting over the past 24 hours (many of them spent rebaking) and managed to reach this point so far:

Working in linear color space + forward rendering, very high quality/high resolution presets selected where ever possible. All other settings default.

My question is, am I heading in the right direction in trying to solve this? Anything else I should be looking at/trying? My last bake took 4+ hours so any advice before I try another round of settings would be appreciated, have only been using Unity for a few days but have picked up a lot in a short time.

Thanks

Try some of the things in my answer here: https://answers.unity.com/answers/1432194/view.html

Specific to your issues: Lower your indirect resolution (2 should be okay), Increase your Lightmap resolution (maybe 200), decrease your lightmap padding (2 should be fine).