After the power saving mode on my phone was ‘always on’ I got a little bit annoyed. After turning my my dear friend Google, I soon discovered it was quite an issue.
I’ve just flashed my kernel with odin and updated with the instructions at the following link: http://db.communityrelease.com/release_display.asp?ReleaseID=593
It looks like the power issue has been fixed and it is sufficiently rooted. Thanks Darky.
Edit: After some testing it still has the issues. I think I might just go back to the Samsung firmware rooted.