Suspension noise (video included)

Was driving the other day and started to notice this noise whenever i turned right and loaded the left side suspension. Its coming from the rear left so behind the passenger.

Took the coil out today and gave it a clean, sprayed a bit of lubricant on the top rubber bushing where it meets the body as i thought it might be rubbing a bit there and noticed that my dust boot was all crumpled and crushing on the shock and spring so i cut it off and will get a new one.

none of this fixed the problem and the noise was still there when i went driving after the reinstall.

any ideas would be appreciated and ill be going back tomorrow to see what else i can figure out.
everything looks fine visually so not too sure.
blown shock maybe? the ride isn't crazy bumpy though.

coilovers are amuse S trye spec with 12k springs all round

http://www.youtube.com/watch?v=6A2QGHCTcLc