Hi docmartin.
I don't know this song but I found it on YouTube at http://www.youtube.com/watch?v=3iaxtY_mt-0
This is the botsweeds' version.
It's a very complicated chord progression so I had to listen a few times to get it right. I'm not surprised you are having problems getting it to sound right. The recording starts in C minor and I can give you the chords in C minor, but I'm guessing they play this starting in A minor with the capo on the 3rd fret. I'll give you both versions anyway.
The C minor version uses chords such as Db min and Gb which can also be played as C#min and F# respectively.
I can't post the lyrics on here because of copyright so I'll just give the 1st word of the lines so that you can see how the chords fit.
Each chord is one beat and further beats are indicated by /
Intro
Cm/////
If you...
Cm/// Ab/// G7///
Pussycat...
Fm/ Dbm/ Gb/// Dbm///
It's that she...
Ebm/ Ab/
What's...
Ebm/ Fm/
She's...
Bb/ Eb/
Child...
Gm/ C/ Cm/
In her life...
Cm Gm Cm Gm Ab/// G7///
Pussycat
Fm/ Dbm/ Gb/// Dbm /
Gb/ Dbm/
Gb/ Dbm/
Gb/ Dbm/
Gb/ Dbm/ to end
In A minor the chords are as follows
Intro Am/////
Am/// F/// E7///
Dm/ Bbm/ Eb/// Bbm///
Cm/ F/
Cm/ Dm/
G/ C/
Em/ A/ Am/
Am Em Am Em F/// E7///
Dm/ Bbm/ Eb/// Bbm/
Eb/ Bbm/
Eb/ Bbm/
Eb/ Bbm/ to end
It's a strange song as it starts in one key and finishes in another!
As I say it's a very tricky song.
If there's still a problem, let me know.
I'm 99% certain of the chords but you never know.