There are caps to the throne room effects. These caps are above what your opponent has.
Throne Room caps:

(if you need help understanding how these work please ask)

TR caps

These are all of them in Values

CombatSkill
BoostName = Knight Combat Skill
Max = 255
Min = none

IntelligenceSkill
BoostName = Intelligence Skill
Max = 145
Min = none

PoliticsSkill
BoostName = Politics Skill
Max = 155
Min = none

ResourcefulnessSkill
BoostName = Resourcefulness Skill
Max = 165
Min = none

From here out are all Percentages———————————————-

Attack
BoostName = Attack
Max = 800
Min = -25

Defense
BoostName = Defense
Max = 4000
Min = -25

Life
BoostName = Life
Max = 200
Min = -50

Speed
BoostName = Speed
Max = 300
Min = -50

Range
BoostName = Range
Max = 150
Min = -25

Load

BoostName = Load
Max = 500
Min = 0

Accuracy
BoostName = Accuracy
Max = 1
Min = -0.1

MarchSize
BoostName = March Size
Max = 150
Min = none

MarchSpeed
BoostName = March Speed
Max = 500
Min = -10

TrainingSpeed
BoostName = Training Speed
Max = 4000
Min = none

ConstructionSpeed
BoostName = Construction Speed
Max = 600
Min = none

ResearchSpeed
BoostName = Research Speed
Max = 400
Min = none

CraftingSpeed
BoostName = Crafting Speed
Max = 200
Min = none

CraftingSuccess
BoostName = Crafting Success
Max = 25
Min = none

Upkeep
BoostName = UpkeepReduction
Max = 33
Min = none

ResourceProduction
BoostName = Resource Production
Max = 2000
Min = none

ResourceCap
BoostName = Resource Cap
Max = 200
Min = none

Storehouse
BoostName = Storehouse
Max = 1000
Min = none

Morale
BoostName = Morale
Max = 50
Min = none

ItemDrop
BoostName = ItemDrop
Max = 20
Min = none