On my soarer (JZZ30), I actually had to lean it out even more. (Up to 17% at one point). The auto soarer with a basic exhaaust (etc), was pig rich.
Now it's at a fairly conservative 11.5:1 pretty much across the board. Made a big difference to the "on the road feel" though. Much more responsive.
If you want my settings feel free to email me. But like others have said, it should be tuned on a dyno with a decent full range lambda sensor or eslse damage can occur.