Compared to other creatures of the same CR:
For this section, I'll try and choose a variety of same CR creatures.
Senses: you gave it darkvision 60ft., perception +17
…..Dire Lion (large animal): low-light vision, scent, perception +11
…..Worg, Winter Wolf (large magical beast): darkvision 60, low-light vision, scent, perception +11
…..nightmare (large outsider): darkvision 60 ft., perception +12
…..gibbering mouther (medium aberration): all-around vision, darkvision 60ft., Perception +12
Conparison: on the low side of average
Hit Points: you gave it 52
…..Dire Lion (large animal): 60
…..Worg, Winter Wolf (large magical beast): 57
…..nightmare (large outsider): 51
…..gibbering mouther (medium aberration): 46
Conparison: within the acceptable range
AC: you gave it 19
…..Dire Lion (large animal): 15
…..Worg, Winter Wolf (large magical beast): 17
…..nightmare (large outsider): 19
…..gibbering mouther (medium aberration): 19
Conparison: on the high side of average
Damage reduction/immunities: you gave it none
…..Dire Lion (large animal): none
…..Worg, Winter Wolf (large magical beast): immune- cold (vulnerable- fire)
…..nightmare (large outsider): none
…..gibbering mouther (medium aberration): amorphous, DR 5/bludgeoning, immune-critical hits, precision damage
Conparison: Your churjiir is right on target. (gibbering mouther has negatives that make up for it’s defenses)
Speed: you gave it 40 ft., burrow 20 ft., climb 20 ft., swim 20 ft.
…..Dire Lion (large animal): 40 ft.
…..Worg, Winter Wolf (large magical beast): 30 ft.
…..nightmare (large outsider): 40ft., fly 90ft (good)
…..gibbering mouther (medium aberration): 10ft., swim 20ft.
Conparison: You are above the average here.
Attack Bonus: you gave it +6, +6, +6, +6
…..Dire Lion (large animal): +12, +13, +13
…..Worg, Winter Wolf (large magical beast): +10
…..nightmare (large outsider): +9, +4, +4
…..gibbering mouther (medium aberration): +7
Conparison: the attack bonuses start to get very diverse at this CR. I think you are within the acceptable range.
Max possible Damage/Round: you gave it 24
…..Dire Lion (large animal): 41
…..Worg, Winter Wolf (large magical beast): 36 ( breath weapon, reflex half)
…..nightmare (large outsider): 32
…..gibbering mouther (medium aberration): 24 (+ 2 con)
Conparison: you are below the average.
Spell like abilities: you gave it 2 at CL 10
…..Dire Lion (large animal): none
…..Worg, Winter Wolf (large magical beast): none
…..nightmare (large outsider): 1 at CL 6
…..gibbering mouther (medium aberration): none
Conparison: a little high, but acceptable.
Special Abilities/attacks: you gave it disease, flea swarm, necrotic wound, rat paramount, and telepathy
…..Dire Lion (large animal): pounce, rake
…..Worg, Winter Wolf (large magical beast): trip, breath weapon (see above)- reflex DC 17
…..nightmare (large outsider): smoke
…..gibbering mouther (medium aberration): blood drain, engulf, gibbering, ground manipulation, spittle
Conparison: you are on the high side of average.