A lot of fluent signers don't always articulate the second letter, unless it's important to differentiate the word from another word (e.g. butt vs but). That's just being lazy, of course, but seems common around here.
The double-Z is usually signed with a claw-2 handshape. Like in 'analyze' or 'travel.' Guess it's very similar to a V handshape, but there's definitely some curvature to the fingers.
