I always tip 20% if not more... I'm very forgiving because even though I'm a good server, I know what it's like to be in the weeds.
Adding gratuity should be up to the server, we call it "a roll of the dice" because if you don't add it you could get really lucky or get screwed.
I usually can read my tables well enough to know that the 20% from autograt is all i'm going to get or if they'll throw down more than that.
I hate to say this, but women almost always just leave the bare basic amount, especially in groups, I had lots of them this holiday season.... Plus they are usually a huge pain in the @ss...
