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Tenebron takes 30 seconds to land. If Sundial/Embrace procs on the first Ice Lance on Sartharion, then expected it to proc 45 seconds later, or 15 seconds after Tenebron has landed (55 seconds later, or 25 seconds after, if you want to be realistic with proc chances).
The math in my head says it's better to have 200 spell power on every Frostfire Bolt and still get Sundial/Embrace in the last 30 seconds of Bloodlust than have 20, 40, 60, etc. spell power and Sundial/Embrace in first 15 seconds of Bloodlust. Sure, it's stacked with Potion of Wild Magic and Icy Veins, but if it really makes that much of difference, just save all your cooldowns till 15 seconds after Tenebron is down, then use them all at once:
/cast Icy Veins
/use Potion of Wild Magic
/use Mana Sapphire
I'm not sure how fast the fastest guilds out there kill Tenebron in 10-man, but our less-than-synergized group kills him in about 60-70 seconds average. I suppose if your group is killing him in 30 seconds, then you might go at this completely different, but for any group that takes longer than 45 seconds, the above seems to make sense to me, at least.
I know some people don't like when when items/talents work a bit different then described but I always thought it was one of the fun parts of WOW. The double dipping frost used to get for hit 6% and more recently the Egg of Mortal Essence. Easter Eggs.
I have an excess of badges so I bought the Egg and the real power of it comes IMO is not just to be a cheap substitute for the Spider trinket but rather to be able to focus the proc as your describing Enthorn. Because Arcane mages can use either Abarr or AM in a rotation you can effectively use it like a /use trinket by holding off casting of AM if you know your about to blow cooldows (AP, Mana Gems). As a Arcane Mage I open with ABX3 and ABarr when Sarth drops.. ignoring MB procs and then once Tenebron drops, blow cooldowns but throw in MB to get the Egg to proc. I can have the two haste (IV and Egg) going at the same time.. lots of damage and a greatly reduced Evo for good measure.
I know its going to change.. but fun for a while :-)