My lowest crawl ratio is 80:1 and it works very well for technical stuff but coming off steep ledges I still gotta ride the brake at times. Also it’s too slow when trekkin through the smooth areas so I’m usually in 2nd or 3rd. At 100:1 I probably wouldn’t need to touch the brakes on those steep drop offs.
When climbing steep sections like where buddy flopped on Greens, I’m in 2nd gear at 43:1. It works well when I need momentum. The trick there is to get the tires smoking until they get sticky 😉