What fights are you having mana problems with?
Also I'd suggest you get rid of your [Thousand-Year Pickled Egg] and replace it with [Relic of Chi Ji], or [Price of Progress] if you can't afford DMC. And you need to get head with socket for [Revitalizing Primal Diamond].

We got 2 heroic version of Qin-xi's trinkets yesterday, we gave them to our shamans for obvious reason, but it made me do some math.

Taken that stat weight is 1 spirit = 0.8 int, these are the net stats values;

Heroic Qin-xi's 2386.8
Heroic Spirits of the Sun 2457
DMC Relic 2136
Jade Courtesan Figurine 1761.95 (on use, no spirit wasted)
Shado-Pan trinket 1762.2 (on use as well)

It looks like the proccing trinkets are totally on top even if one or two spirit procs are wasted at the beginning of a fight.

Keep in mind spirit can also translate into throughput via using DL instead of HL more often, and that's one of the things Blizzard will balance around in later tiers actually.

Beacon is a key point to consider for stats because of different playstyles and needs. If you're indirectly healing the Beacon through things like HL then mastery's value might decrease because you're not shielding the Beacon target. However, if you're directly healing (especially with FoL or DL and getting the extra HoPo) and such then mastery is very valuable since that target is pretty well guaranteed to be taking heavy damage if you're using that option.

In some respects crit and haste might be considered more valuable if indirectly healing with Beacon because the extra healing from crit means extra healing on the Beacon, and of course faster casts mean faster healing and potentially more healing if you squeeze more casts into a certain time period.

Intellect simply adds numbers. Depending on the spell cast it might be worth more than secondary stats, but it can also be worth less especially when gems come into play. It will entirely depend on the player's needs though, and those needs can't be quantified with a blanket stat weight like how DPS and even tanks do because there is no objective way to deal with everything.

One of the things I'd like to do is compile a list of strategies for each boss which should help determine which stats are best for which strategy, and then maybe average them to say "generally X is the way to gear because it provides the best all around healing for these fights," and then of course trinkets and strategy change can be used for major fights that don't quite fit into that paradigm.

I'm considering creating some silly "Joe Ego materializes from the mists" introduction...

I've updated my spreadsheet to account for higher mana values (up to 25,000) and up to 15 Shocks per minute.

On the one hand, the Glyph can look really good at high Shock cast rates. Plus, without even gearing for extra Crit, 50% is not unreasonable after accounting for the raid buff and Shock's bonus. The potential for 15 casts per minute, ignoring Sanctified Wrath, is very impressive.

On the other hand, the PTR t14 4-piece bonus gets us maybe 2 extra Shocks during 20 seconds of Avenging Wrath. Sanctified Wrath must then be used to enhance regeneration, but we won't be able to cast any other spells for 30 seconds if we assume it results in a 2 second cooldown when stacked with the t14 4-piece bonus. I don't think we would even be able to cast WoG/EF or LoD in between. Then again, we could get about 12 extra Shocks.

Going with a 50% Crit rate, that's approximately 3,000 * 6 = 18,000 additional mana every 3 minutes or 500 Mp5. Unglyphed, 1,000 Sprit gives over 560 Mp5. So if we use my spreadsheet to find a cutoff then will see that t14 4-piece + Sanctified Wrath would allow us to move our cutoff nearly 1,000 Spirit higher.

For example, assuming 8 Shocks per minute with 50% crit rate means a cutoff of about 8,859 Spririt. The additional 500 Mp5 from a 30 second regen cycle of pure Holy Shock casts moves that cutoff to about 9,800. If I could increase my casts per minute to 9 then my cutoff moves to 9,967 which shows how my normal cast rate has a larger effect than the tier or talent bonuses. I would rather use a 1,000 Spirit flask for a larger mana return with no maintenance and have Avenging Wrath available for use as an output cooldown.

TL;DR: Glyph of Illumination is still very dependent on casting Shock frequently. The t14 4-piece is only a regen benefit when talenting Sanctified Wrath, using AW for regen instead of output, and chain casting Shock for 30 seconds at a time - all for an average of 500 Mp5 or less than 1,000 equivalent Spirit.