The reason your not getting much response is that the information your asking for is covered in depth multiple times already here on the forum.
Spend some time with the search function and browsing the forms and I'm sure most all your questions will be answered.
WI is generally sized based on fuel usage, and fuel usage is always solidly tied to your power output.
Since you are clearly running a boosted engine I would suggest you take a look at the "Gasoline - Forced induction" forum.
This thead is also a good place to start --- it is a sticky on how to tune with WI.
http://www.aquamist.co.uk/phpBB2/viewtopic.php?t=457
Larry