The portals add 3.5" width per side. No doubt committing to a wider track width. Which should account for the taller profile and add back stability. Yes, I'd agree it would be a better pairing with stock control arms. Even though the portals make things wider, it does maintain scrub radius to preserve good geometry.
My tiny LX on 35s next to his Portal'd Bronco IIRC on 38s.
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74Weld made a good tech video that talks at length about many of these concerns.
You need to convince Quinn to build the portals in such a way that moves the center of the wheel magically forward enough to allow a 40 to clear the firewall (then my trimming works perfectly for a 42!).
…and can I request an updated photo with your 37’s now parked behind his Bronco?