Okay, I recently saw a 740I Sport with 745I Sport Style Wheels - The wheels are also known as Star Spoke 128. I have to say, WOW. It looked awesome.
I'm looking to get the same set-up as him, this is his set up ...

1. 20" factory 745i sport style wheels, 20X9 fronts and 20X10 rears

2. Nitto Extreme 555 255/35/20s fronts and 285/30/20s in the rear with perfect offset, no rubbing at ANY circumstances.
He says the offset is 38 front and back ....

3. H&R Stage II lowering springs (lowers 1.9 inches in front and 1.3 in the rear)

I'm looking to get the exact same set-up/look.
I contacted a dealer which sells replica 745I Sport Style wheels, and he told me that the offset was to high for a 7 series, any comments upon this?

I'd like to post a link of the wheels on the car, but I'm not allowed sadly.
Anyways, what's the proper offset that I should have on the wheels so they sit perfectly for this setup? I DO NOT, want to use hubs.