A few drum&bass tracks circa 1999-2002

[kdgood]

Hi!

Please help to identify the following tracks by attached excerpts.
The first 3 are from 2001 mix, so they should be from 1999-2001. Track N3 ends abruptly because it's the last track in the mix.
Tracks N4-6 are from 2002 mix, they be should from 2000-2002.

Any hint is appreciated Thanks in advance!

Identified tracks:
1 = Acen - Bloodsucker [Redmaster Records]
2 = Swan-E & Undacut feat. Ruby Turner - Sweetest Hangover (DJ Hazard Nocturnal Mix) [Maximum Boost]
4 = Cause 4 Concern - Volcam [Subtitles] // thanks to pickled
5 = DJ Friction - Oblivion [Trouble On Vinyl]
6 = Sons Of Mecha - Feel No Way (Future Cut & DJ Kontrol Remix) [Mechanoise Records]

[kdgood]

Need your help

[pickled]

04 is Cause 4 Concern - Volcam

[kdgood]

04 is Cause 4 Concern - Volcam

Wow, this was in identification for almost 4 years. Thanks a lot!