Impressive post Adam ..
One thing that come to my mind it's .. the ECU can lock the TC .. ? ( was thinking that was only posible by fluid pressure and rpms .. )
When my 80 was automatic ( not anymore
) I was able to see 210°F max temps down here .. ( with outside temps of 100°F ) but in all cases it cools down ..
The cruising speed at flat road don't help much ini my case .. maybe due to the 315 Toyos ..