Snow Patrol - Signal Fire Chords & Tabs

Snow Patrol - Signal Fire

I've used the other tabs and found that they don't sound quite like the song at all. I 
upon this tuning and chords while learning to play another song and it just seems to fit.

Tune your guitar from E A D G B E 
Db Ab Db Ab Db Db

I am unsure of the chord names but these are the tabs.

  Db5  Gbsus2   Ab4   Bbm7
---0-----0-------0-----0------|
---0-----0-------0-----0------|
---0-----0-------0-----0------|
---0-----0-------0-----0------|
---0-----5-------7-----9------|
---0-----5-------7-----9------|

The progression is either:

Db5-Gbsus2-Ab4-Gbsus2
or
Dd5-Gbsus2-Bbm7-Ab4

Intro

Db5-Gbsus2-Ab4-Gbsus2 (x2)

Verse 1
[ Tab from: https://www.guitartabs.cc/tabs/s/snow_patrol/signal_fire_crd_ver_4.html ]
    Db5     Gbsus2      Ab4        Gbsus2
The perfect words never crossed my mind
                 Db5        Gbsus2    Ab4    Gbsus2
'cause there was nothing in there but you
       Db5   Gbsus2      Bbm7          Ab4
I felt every ounce of me screaming out
        Db5       Gbsus2          Ab4    Gbsus2
But the sound was trapped deep in me
Db5   Gbsus2      Bbm7            Ab4
All I wanted just sped right past me
            Db5    Gbsus2      Ab4    Gbsus2
While I was rooted fast to the earth
  Db5      Gbsus2           Bbm7     Ab4
I could be stuck here for a thousand years
             Db5     Gbsus2  Ab4    Gbsus2
Without your arms to drag me out

Chorus

Db5         Gbsus2                Bbm7     Ab4
  There you are standing right in front of me
Db5         Gbsus2                Bbm7     Ab4
  There you are standing right in front of me
Db5        Gbsus2             Bbm7     Ab4
  All this fear falls away to leave me naked
Db5        Gbsus2                   Bbm7        Ab4
  Hold me close cause I need you to guide me to safety
Db5   Gbsus2  Bbm7 Ab4    (or Db5 Gbsus2 
Gbsus2 your option)
  No, I won't wait forever


Verse 2
Db5    Gbsus2            Bbm7-Ab4
In the confusion and the aftermath
    Db5    Gbsus2 Ab4  Gbsus2
You are my signal fire
    Db5  Gbsus2             Bbm7-Ab4
The only resolution and the only joy
       Db5            Gbsus2              Ab4  Gbsus2
Is the faint spark of forgiveness in your eyes

Chorus

Db5         Gbsus2                Bbm7     Ab4
  There you are standing right in front of me
Db5         Gbsus2                Bbm7     Ab4
  There you are standing right in front of me
Db5        Gbsus2             Bbm7     Ab4
  All this fear falls away to leave me naked
Db5        Gbsus2                   Bbm7        Ab4
  Hold me close cause I need you to guide me to safety
Db5   Gbsus2  Bbm7 Ab4    (or Db5 Gbsus2 
Gbsus2 your option)
  No, I won't wait forever

Enjoy.