I kind of thougt you left the magic word out ("not"). Been a while since I've done auto too, since going Prop Cat. But when I did do Multi-line, CCC & Mitchell were the 2 main ones. It's changed a lot on auto in the past few years, just like it's changed on Prop losses. But the auto claims changed first, with a big reduction in adjuster involvement unless 3rd party & injury involved. An awful lot of direct repair with digital photos & ests direct from the body shop.
You might want to check with the body shops that have big volume, and see what the carriers are requiring them to use. Might still drive your guys nuts though!