Personally I feel that Provoke should always be saved as a backup. Shield lob / Tomahawk are more than sufficient for initial pulls. Yeah you have marginal extra distance, but why is that distance so important to you? I've never had an issue with grabbing a mob that way. It's best to have a provoke ready to go, especially if you're doing large / boss pulls where there's the danger that someone will steal hate from you... using it at the start creates an unnecessary risk since it's immediately on cooldown. Say for example you voke-pull bahamut in T13, and shortly after a blm nukes it and grabs hate. Now you're going to be ping-ponging hate trying to grab it back, instead of having a voke all ready to go to pluck it back easily.