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I do not want to hear your impression, what you would house rule or what you think about the topic; do you know if there exists rules president's for this question:
Can I select a prestige class to level up your spell casting when you go into a second prestige class?
Specific example is Mystic Theurge into Agent of the Grave.
AOTG text:
Spells per Day/Spells Known
When a new Agent of the Grave level is gained, the character gains new spells as if he had also gained a level in a spellcasting class he belonged to before adding the prestige class. He does not, however, gain other benefits a character of that class would have gained, except for additional spells per day, spells known (if he is a spontaneous spellcaster), and an increased effective level of spellcasting. If the character has more than one spellcasting class before becoming an Agent of the Grave he must decide which class he adds the new level to for the purpose of determining spells per day.

"A spell casting class he belonged to before adding the prestige class"
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Mystic Theurge is a spell casting class
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1) is there a general rule somewhere that says spells per day has to be a non-prestige class?
2) does the specific text of MT count as different enough that it doesn't sync up?
3) don't tell me what you would do; I already did it. The campaign is over. I want to hear about the academic rules discussion. Thank you

This thread is pretty cut and dry; does something stack and how. RAI or RAW.

1) Undeath: Heal—This works like a standard channel (not halved). Harm—The healing effect is enhanced for undead creatures and those with negative energy affinity.

2) Some variant channeling abilities are enhanced when used on particular creature types. Such channeling increases the normal healing or damage from channeled energy by 50% for that creature type, rather than the default half healing or damage for the alternative channeling

3) Unlife Healer (Su)
At 8th level, the undead lord’s spells, spell-like abilities, and supernatural abilities used to heal undead heal an extra 50% damage. At 16th level, these effects automatically heal the maximum possible damage for the effect + the extra 50%. This does not stack with abilities or feats such as Empower Spell or Maximize Spell.

Obviously it's about channeling negative energy. Since it's a variant and not an ability or feat: does the added negative energy from the variant channeling stack with the added negative energy from the class feature?
Do we call it an ability and limit the optimization to 150%? (it doesn't stack)
If it does stack, does it multiply or add to itself? 100% + 50% + 50% = 200% or 150% x 150% = 225%
And lastly; does it all maximize at 16th level?

Discuss.