That a flatter rear tire won't turn as well as the front only means it won't be a scalpel. I also don't see how braking would be unduly compromised by running a flatter profile on the front compared to a triangulated tire. That's counter intuitive. You know that fatty on the front of the DR650? That's a rear. It's not holding me back too much. Maybe ask Dougie
Awfully tempted to go 130/80 rear on front, some real gains to be had there with softened rake/trail but I feel 130/70 should be the first try(had a b/n sitting on a shelf anyway) and I can keep the stock fender.