There are a couple of skips that exist in grave undertaking, but this is the fastest and safest - it's a bit of a complicated one, but it's definitely worth the practice. At a later date, I'll go through and

https://www.youtube.com/watch?v=ukmZ7PFIOJQ&feature=youtu.be

From there, there is a short skip OOB to get to Down Home Cooking faster

https://www.youtube.com/watch?v=jl5hDVihQb4&feature=youtu.be&t=5153

DO NOT follow Zen's pathing after that, this is an older route that's no longer considered the fastest.