The beauty of Crane stance is the ability to easily stack some Mana Tea at the beginning of every fight. This extra mana is very valuable for later parts of the fight and if you want to play a hundred percent optimal, you should always try to do it. There might be some fights where the mechanics are a bit antagonistic to switching between melee and ranged positions, but usually you can find a way to jump back and forward.
If you want to perfect your opener, there are several things you should think about. The first one I think is mandatory for anyone who want to optimise themselves; always use the best food and flasks in any raid encounter. That means the +100 multistrike rating food either from Savage Feast or a Fiery Calamari, and +250 intellect from Greater Draenic Intellect Flask. Don’t be cheap on this!
Before the pull you should already have placed your Jade Statue properly and don’t have any spells on cooldown. Start by stacking up some Chi with Surging Mist. Chi degrades one per ten seconds out of combat, so keep stacking it until you are ten seconds from a pull. You should always have 4 chi when you enter a fight and a full mana pool. Remember not to use Chi Brew before the pull, all Mana Tea stacks it generates will be wiped as soon as the boss is pulled.