Yes that is with 3.1 mechanics. No LHW does not stop getting haste increases since LHW is capped (throughput-wise) by the gcd. Haste lowers the gcd. That the actual cast time is lower than the gcd is irrelevant to the calculated HPS since that is calculated by the gcd.

I believe the "best" HPS rotation is rather RT->HW->HW->CH->HW->HW (with chain heal on the riptided person obviously). This also does not require any cooldown reduction on Riptide. This is obviously mostly academic since there's no way to do this without massive overhealing, in actual fights Chain Heal spam with the occasional Riptide/HW when it seems possible without overhealing (typically after breath on sartharion or on drake tank during twilight torment) is probably best HPS.

Timing Riptide like this is about as theoretically useful as the Lifebloom bloom. Practically, it's not going to yield you too much effective healing.

As it stands now, if you know a large burst of damage is coming, like say, from XT-002's Tympanic Tantrum, you can already keep two Riptides active amongst a clump of players and use them as you see fit. The glyph will allow you to use three, but the times when three will be useful are going to be much much less common than times when two are useful.

On the subject of Earthliving vs. Healing Stream: Earthliving is definitely going to get more mileage while tank healing, but, most resto shaman wont be doing that. From a raid healing standpoint, according to Daidalos' spreadsheet, glyph of healing stream totem provides roughly 21 HPS per person (~105), while glyph of earthliving weapon is a bit more variable.

While chain heal spamming, you're looking at 4 chances per cast with a 25% chance to proc earthliving, with 264 HPS per proc. My next few problems with this glyph are where the numbers get over my head, and probably better suited for someone else to crunch to find the actual value of this glyph. In a null damage situation, you only get one chance to proc earthliving per cast. In a constant damage situation, there is always the chance you will proc earthliving on someone who already has it, which will yield less HPS than if you had procced it on someone who doesn't.

Glyph of Earthliving Weapon's viability in comparison to Glyph of Healing Stream Totem also has a lot to do with how many targets in a given situation you can bounce chain heals off of. How often are the casters going to be able to clump up in Ulduar? How many melee do you generally run with? This isn't to say Glyph of Healing Stream Totem doesn't have similar drawbacks; such as it's lesser value in encounters where raid damage is randomly determined, and a proc off of direct heals is going to be better than a hot to your specific group.

If Glyph of Healing Stream totem does come out to being better in a constant and predictable damage scenario, which I'm fairly certain from my admittidely weak grasp on the numbers, then the determining factor on which of these glyphs to use is going to be purely based on which fights are tougher in Ulduar; the ones with constant damage, or the ones with unpredictable bursts.

Did Healing Stream stay partywide? I'm running under that ssumption since a raidwide HST that is talented for 45% and glyphed would on fights like Sapph or Mimir (the Keristrasza'esque boss right?) be a wonderful, perhaps too wonderful tool.