Opinions on proposed wheel specs

So my Vishunu's are pending sale and I picked up a different set of used wheels to play with and rebarrel.

Current specs of the wheels:

FRONTS: 20x9 +31 / Hi disc / 2" lip
REARS: 20x10 +25 / Lo disc / 3.5" lip

Thinking of the following specs after rebuild

FRONTS: 20x10.5 +12 / Hi disc / 3.5" lip
REARS: 20x11 +12 / Lo disc / 4.5" lip or 20x11.5 -1 / Lo disc / 5" lip

I'd take the rear outer lips and move them to the fronts.  Then just purchase new outer lips for the rears.  These are going on a 2004 LS430 with shaved fenders in front and rolled fenders in the rear.  

By my calculations, this will push out my fronts 19mm more than my current Vishunu setup in the front and 18mm/37mm more in the rear.  Thoughts?

The fronts are going to come out 38mm in the front/26mm in the rear with the specs listed.  Are you accounting for spacers on your car in your current specs of the wheels stats?

 
Nevermind, i just realized the way the way you plan to do this:
[QUOTE]I'd take the rear outer lips and move them to the fronts. Then just purchase new outer lips for the rears[/QUOTE]

I'm not sure how this will work but if you end up with the specs after rebuild then youre looking at 38/26.

My current effective setup with my Vishunu's with spacers are 

20x9 +12
20x10 +17

No spacers will be used with the new setup, since the front faces are hi disc.

Rears sound like they are going to be 20x11 +0 w/ 4.5" lip or -13 w/ 5" lip