"I can say that yes, turn-in it effortless, but I thought that was simply how the FJR is."
I think the answer to that is "it depends".
As a 250lb guy without gear when I got my 2014 FJR1300 ES with a fresh set of stock sized Angel GT tires in December I completely blew the first low speed corner on the test ride and went way wide in the second because the bike took SO much more effort to get to tip in than I expected. Even when I got used to the bike and had the tires inflated to 42psi front and rear it felt like one of those bottom weighted blow up punching dolls; the further I pushed it down the more it resisted and wanted to spring back up. This felt completely bizarre to me, especially coming from a bigger bike with a longer wheelbase and a 205/50R17 car tire rear that required no more than the pressure from a single finger to get it to happily flop right over to the pegs.
At first I assumed this surprising amount of effort was mostly tires, these guys have done quite a bit of testing of the big 3 Sport Touring tires (Roadsmart, Road, and Angel GT) and basically came back with don't bother with Pirelli Angels, they take a lot more effort to tip in and don't last nearly as long as the other two:
Road Dirt’s summer tire shootout is back. Last spring, after Dave “White Girl” Wensveen and I grossly over caffeinated ourselves, our acute grasp of the obvious made us realize we had the exact same bike. I suggested that it would be a perfect test bed for tires. Two identical bikes, two...
roaddirt.tv
However stiffer front springs made a HUGE difference in reducing tip in effort, which I think is likely why heavier guys don't seem to like these bikes as much, I don't know for sure but there seems to be a sharp drop off in handling feel when you go much over average size and surpass what was planned for with the stock suspension. I still think the tires likely play a big part as going from the 180/55R17 rear Angel GT2 at 42psi with about 6k miles on it to a 205/55R17 Crossclimate2 car tire with 35psi made VERY little difference in steering effort, so I assume that rear Angel GT2 had to be putting up a pretty solid fight against tipping.
Since I haven't tried anything besides the 120/70R17 Angel GT up front I don't know for sure yet how that affects things, but I am going to laugh if putting on a 150/60ZR17 Mutant Rear on the front reduces the tip in effort.