High Transmission Temperatures :(

Add your Torque convert temps as well as it is the "leading indicator" for the sump temp. You will be amazed how fast it climbs in "D"rive as soon as you start to load/lug the engine. You'll be equally surprised how fast shifting into "4" stabilizes temp. Given your setup you should strongly consider adding a larger trans cooler. Simple to do.

 

I constantly monitor my trans temps at the pan and TC. Just something I've habitually done. Anyway, your current temp readout seems fine to me. Cooler weather helps keep it down. I've never seen my TC temp into the high 200's or 300 deg F. In my opinion, the TC temp isn't that far off the pan. Maybe 20 deg F higher at most? That's with me towing, up a long steep incline.

At those temps, I don't think you need to upgrade your trans cooler. I can see if you're constantly in the low 200 deg F, but doesn't seem like it.

Glad you figured out the scaling, haha.