Has anyone ever run 17x8.5 +10 on the front? What tire worked for you?

Yeah I'm super bummed about the "Rims 'n Tires" calculator!

So I would definitely not call a 17x8.5 +10 ideal. But you definitely have options. That's a 4.9" backspace, so it should clear the outer tie rod end no problem. Compared to my set up with 18x9's +30 and 275/35/18's, a 245/45/18 would stick out about an extra .2". So what I would say is this, it depends on your ride height and how much work you're willing to do to your fenders. If you're lowered, you'll need to work the fenders. If you run closer to stock ride height, maybe not all that much will be required.

The most extreme example I know of is @Craig Burriss. He's running 285/35/18's on 18x9.5's with a +12 offset. His tires are a full 1" further out than mine are. His fenders are also pretty heavily worked, so, it's all about how much work you want to do to your fenders. Craig's thread is here, complete with me telling him it wouldn't work and him proving me wrong. In my defense, he did a lot of cutting on his fenders. But it definitely shows that anything is possible with enough work, and he still needed to do less than I thought he would.

18x9.5 +12

Also, here's a new wheel calculator I found. Not quite as user friendly as the old one, but it does what it needs to do
Rim & Tire Size Calculator. Custom Offsets