I'm no drain mavin, but if I were doing the job for myself I'd put in a
tee and threaded plug under the sink and try and create the two 90
degree bends down in the crawl space with a couple of 45 degree elbows each.

That to make it easier to run a snake through the line if that long
horizontal run ever gets glogged with hair or something else over time.

I'll do that. Thanks for the suggestion.

Gary