Oh and I should mention that TBK found out that it's actually a bit better to have your settings slightly above 8/50%/default. This way you get a slightly better normal speed while your boost speed still stay the same. One step above this and your boost speed decreases making it worthless. It doesn't make a huge difference, but I think it's a pretty cool discovery nonetheless.
Lightning - Volute II - 1'43"31http://www.youtube.com/watch?v=2-0Rb0_hWXM - A pretty terrible run considering I many times had under 1'43 runs going, but failed on the 4th or 5th lap. Still I'm happy with this time and also happy to not having to play this track anymore.