Wrongwarp increased CDR speed

What went wrong?

Wrongwarp does not effects the CDR of Teleport as expected.

Tested as Magewith Teleport.

Assumption
All sources of “increased CDR speed” are additive:

effective_cooldown = cooldown / (1. + sum_of_inc_cdr_speed)

Observation
The above formula holds true for all kind of combinations of mage/teleport talents. As you can see from the examples provided below.

When exuipping my 51% CDR wrongwarp in any combinations I essentially only receive 15% CDR. I cannot figure out a “modified formula” which would use the 51% from the item, even for considering different way of combining the CDR values.

Thanks!

################## No Wrongwarp

Teleport
* 50 intelligence (12 CDR)
* no Mage Flurry
* Mana Tunnel (+6s CD)
* 5/5 Tunnel Finder (50 CDR)
-> In game: 6.8s CD
Probably: (5 + 6) / (1 + 0.5 + 0.12) = 6.79

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 5/5 Tunnel Finder (50 CDR)
-> In game: 6.4 CD
Probably: (5 + 6) / (1 + 0.5 + 0.12 + 0.09) = 6.43

Teleport
* 50 intelligence (12 CDR)
* no Mage Flurry
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
-> In game: 7.7s CD
Probably: (5 + 6) / (1 + 0.3 + 0.12) = 7.74

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
-> In game: 7.3s CD
Probably: (5 + 6) / (1 + 0.3 + 0.12 + 0.09) = 7.28

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
* 1/4 Comet Rush (5 CDR)
-> In game: 7s CD
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.05) = 7.05

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
* 2/4 Comet Rush (10 CDR)
-> In game: 6.8s CD
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.1) = 6.83

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
-> In game: 4.1s CD
(5) / (1 + 0.12 + 0.09) = 4.13

################## With Wrongwarp

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 5/5 Tunnel Finder (50 CDR)
* Wrongwarp (51 CDR)
-> In game: 5.9 CD
How? 
* All additive
(5 + 6) / (1 + 0.5 + 0.12 + 0.09 + 0.51) = 4.9
* Wrongwarp effects only some CD
(5 / (1 + 0.51) + 6) / (1 + 0.5 + 0.12 + 0.09) = 5.44
(5  + 6 / (1 + 0.51)) / (1 + 0.5 + 0.12 + 0.09) = 5.25
* Wrongwarp numbers switched: 0.15 instead of 0.51 CDR
(5 + 6) / (1 + 0.5 + 0.12 + 0.09 + 0.15) = 5.91

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
* Wrongwarp (51 CDR)
-> In game: 6.6s CD
How?
* All additive
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.51) = 5.44
* Wrongwarp numbers switched: 0.15 instead of 0.51 CDR
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.15) = 6.62

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Mana Tunnel (+6s CD)
* 3/5 Tunnel Finder (30 CDR)
* 2/4 Comet Rush (10 CDR)
* Wrongwarp (51 CDR)
-> In game: 6.2s CD
How?
* All additive
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.1 + 0.51) = 5.19
* Wrongwarp numbers switched: 0.15 instead of 0.51 CDR
(5 + 6) / (1 + 0.3 + 0.12 + 0.09 + 0.1 + 0.15) = 6.25

Teleport
* 50 intelligence (12 CDR)
* Mage Flurry (9 CDR)
* Wrongwarp (51 CDR)
-> In game: 3.6s CD
How?
* All additive
(5) / (1 + 0.12 + 0.09 + 0.51) = 2.91
* Wrongwarp numbers switched: 0.15 instead of 0.51 CDR
(5) / (1 + 0.12 + 0.09 + 0.15) = 3.68

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