I still can't say enough about my 3.0" wide tires, they provide a ride that I didn't think was possible on my local trails. I alternate back and forth between the Trek Stache 29+ and the Spec Stumpy 6Fattie, honestly I think I still have more fun on the Trek. The grip of the 29+ tires is just phenomenal. The Stumpjumper is my comfortable bike, my Stache is my fun bike.
The 2017 Fuel EX looks to be a great bike, combining a lot of what I like about the Stache along with many of the things I like about the Stumpjumper. I think Trek did a great job with the Chupacabra tires, they have good grip, provide a good ride, have low rolling resistance, are fairly light, and hold air well. The only thing I don't understand is why Trek chose to go 2.8" wide on the 27.5" tires, IMO 3.0" would be the better choice. If you've not already converted them to tubeless, don't hesitate, pull the tubes and reap the benefits.
The Fuel EX 8 Plus should be a great do everything bike for you. I've not ridden one, but if it's anything like my SJ, you're going to be really happy with your purchase. Like my SJ, I don't see much on that bike that I would want to upgrade. The GX drivetrain is good, so far not giving me any troubles on my Stumpjumper or my Stache (before I changed the Stache out to XX1 parts). My only other suggestion for you, Pack66, is to try out the Bontrager Inform Satellite City Grip, by far my favorite grips at this point in time. At first I wasn't sure I would like those grips, but after 500 miles, they have really grown on me.
Enjoy your new ride!