It is certainly possible to Canni twice before a tick, you just gotta do your Canni's the moment you get a tick and then sit immediately. A bit too tight for general use though.
You should almost always be sitting in time for a mana tick or it's hardly even worth standing to canni as otherwise you loose out on a lot of efficiency. I think it's like 20 mana back when sitting at 50-ish? The macro listed above is almost what i run, slightly different timings so if i fizzle i can hit my canni gem and i'll still auto sit in time. You'll need to hit it asap after a tick regardless of differences in /pause times.
The one time i will spam canni standing is if i have a bard in group and i need all the mana i can say if i'm slowing on a raid for example. But if you have a canni spam macro then you can still sit in between canni's as the recast time on spells doesn't effect sitting, this is how you can canni twice and be sitting in time between ticks.
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58 Shaman
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