No they shouldn't, sorry.

Here's me being devil's advocate or maybe just pedantic.
nb. this isn't knocking you Baalz for kindly sharing this stuff:

That's a HAT spec (mentioned above), which solely relies on your group's crits to generate combo points; this means that if a member of your group dies, not only has the raid lost that dead member's DPS, but your DPS plummets too. Literally making you useless.
Couple that with the new encounters in UD (where people do die more often), and I'd say the build whilst on paper is good DPS, is actually awful, as it requires a stacked group, zero deaths, etc.

HAT specs are rare as only 1 Rogue can spec it per raid, due to the stacked group requirement I already mentioned.

I do my Class homework, and whilst stuff like SimulationCraft is helpful, it often misses out external factors like the scenarios/issues I mentioned above. I read/test all the spreadsheets, but use them as a pooled resource, not a holy bible.

Just a warning in case people panic and think they have to spec exactly how SimuCraft dictates.

Too Long; Didn't Read version:
A useful tool, but not the law of raiding.

yeah, ofc its not meant as a holy bible...but merely as a guide which may help some people who perhaps don t know their classes inside out...
I still maintain that as a guide a rogue, raid buffed should be able to produce around 60 % of the theoretical max. figures, which you do and more besides, so clearly thers no problem there.
its also an indication that in practice a different spec may be better, for instance pre 3.1 afflic warlocks had potentially the best dps outputs....if you could maintain a 7-8 spell rotation perfectly and stay out of the fire as well....if one of your DoTs fell off then dps came down...a lot.
But this post may help those that currently come nowhere near their class potential and steer them towards better spec / rotations etc...because frankly unless everyone can reach their potential we re never gonna get any hard modes down.
It also shows that shamans are somewhat behind other classes in terms of max. dps output( 60 % of their theoretical max is around 3700dps wheras 60 % of a locks theoretical max is nearer 4000) so if ours feel they are underperforming compared to other classes its not them, its Blizz that have caused it
Baalz

Haste helps even if it would mean clipping imo since there is not many fights where you can stand still and let channeled spells run full duration, ofc it will happen but in most cases you will need to move before you have managed to get them off. More haste means less time you have to stand still to get max output from the spell. But those kind of things will never show in a simcraft situation as it simulates fights where there is no movment involved (not many of those in Ulduar). This doesnt only goes for channeled spells, getting that shadowbolt off 0.5 secs faster can mean that you get it off instead of canceling it to move out of that nasty fire/snow/pizza. Worst case that 0.5 secs can mean you get it off but get hit by that pizza in your face critting you for 5.000.000 damage.

Haste helps yes but crit helps tons more, unlike the theorycraft which says they're more or less equal.
SP highest damage spell is mind blast and any rotation should give absolute prio to this spell. The ideal situation is when 2 mind flays = 1 Mind Blast CD. Anything else means you either lose time bc the spell is allrdy off CD when you are channeling MF, or you loose time after MF is cast waiting for MB to come off CD.
Unlike warlocks, SP simply keep their DoTs up and then rotate Mind Blast and Mind Flay untill a DoT needs to be renewed, so the ideal haste value really matters. The amount of haste needed to get 3 MF off is way too high to aim for. Thus haste = mostly crap for SP, especially since DoTs don't benefit from it, whereas they benefit greatly from crit..

The problem is all SP spells are on cooldowns, so haste hardly benefits them. But yes spellpower > all, but the choice is usually between crit or haste, spellpower on most items remains the same