I wonder if there was a bad alignment on the non-pp one you drove. I just don't see how it could understeer so significantly more than the pp model (non DCC) if everything else was the same. So far, I haven't found my non-pp model to understeer that bad, and even some late braking brings the back end out a bit pretty effortlessly.
I still own the non-PP, my son drives it. When I took it to do a more aggressive autocross alignment, nothing was out of spec.
I'd guess the factory Hankook AS, no VAQ, and stock rear sway are why.
You have decent tires on your car, and while I've noticed at the limit, more grip equals more understeer balance, on the street you likely never exceed the grip of a decent set of tires, so you don't notice any understeer. The Hankooks would give up pretty easily and start to push.
Perfect example, my RE71Rs are just about done. On the street, I'd have to really push them beyond what safe to feel understeer, but trust me, it'll understeer.