ARK's base taming speed on PC, PS4, and Xbox is now doubled, meaning 1× is as fast as what 2× was previously. Dododex has been updated to reflect this. Use the "presets" dropdown for common multipliers.
For full Ravager taming details, get the taming calculator app.
I would suggest bringing 5-10 bolas and a decent health and/or attack creature, and killing all but the one or two highest levels in a pack, then using bolas and taming one. Also bring LOTS of tranqs, took me about 30 hits on a 150 to down it