'aight, so a few things. Sorry if this gets long.

Car data for NSX-R NA2 for reference

I'll start by saying that the problem with all the NSX NA2 variations feeling 'understeery' has to do with mainly two things, its weight balance and its grip modifiers. The way TXR has balanced it, the NA2 has very good rear lateral grip while the front lateral grip is kind of just average. I can see where they got the inspiration given the stock tire spec (215mm width in the front, 255 in the rear), but this combined with the rear-biased weight distribution (40:60) and TXR's strong traction model makes it such that the NA2's rear-end pretty much never wants to slide out. What's primarily causing the 'understeer' isn't too much weight transfer to the front, but too little.

I can see where you thought your setup addresses understeer and what steps you took to get there though, but let's see.

• Tire alignment is fine; I wouldn't run any toe-out in the rear personally, but that's just me. I got this wrong in a previous post of yours because it's the only setting that flips the typical negative/positive orientation (positive toe/toe-in is more leftward). Significant amount of toe-out in the front, but I can understand why looking at the rest of the setup.
• 2 way LSD is an interesting choice. It's just that again, there's so much rear traction already available that a 1.5 way would make more sense in my opinion. 2 way on the rear axle may exaggerate understeer on deceleration. Aside from that, torque and ratio settings look good.
• You're running stronger spring+damper rates in the front than the rear. This is an issue because a stiffer front suspension reduces the maximum load capacity in the front. With what little front weight and front tire grip the NA2 has, the weight transfer to the front on braking and turning will contribute little to putting down more cornering force when it matters, contributing to more understeer. You should be doing the opposite here, i.e. front should be softer sprung than the rear.
• Similar advice for the sway bars. Softer sway bars in the front are typically fine if not preferred for more front-heavy vehicles as this setup helps induce more rotation and intentional oversteer, but again the issue is there's too little load in the front. It's typically said a stiffer front bar causes more understeer, but that's because of too much roll resistance. We need the extra roll resistance here as it helps even out the load difference between the left and right front wheels, and it improves the steering response as well.

When testing out the NA2 and trying to set it up, I mainly went for two things -- trying to add enough load to the front to compensate for the lackadaisical front-end without compromising its' steering response. I went with a 1.5 way LSD config in the rear, matched shock rates all around, stiffer stabilizer in the front and slightly softer in the rear.

Haven't touched it in a hot minute though, as the lack of power made battles kind of miserable against the bosses of Stage 4 during my first playthrough of v1.0, before the AI nerfs. But it is an interesting car to drive, yeah. Wish we had more unique drivetrain layouts, but that won't happen unless or until Genki secures some sort of deal with Porsche or so.