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Thanks so much for your thoughts! I did have a small coolant leak in the thermo element of the throttle body. That seems to be a relatively common issue. Not sure if that would be a big enough deal to cause overheating under heavy load -- I wasn't losing much coolant -- but perhaps it impacted the pressure in the system. I've replaced the oring and sealed everything with RTV. (Great how-to here: https://www.clubxterra.org/threads/thermo-element-idle-sensor-rebuild.38432/). Would have replaced the whole thermo element, but that part is shockingly expensive. Hopefully that will solve the coolant issue. The fluid itself is still very new, as is the water pump and thermostat. Regarding the low power frustration -- I'm glad to hear that this is probably just a result of the engine being underpowered and the transmission being frustrating. Next time I'll try turning off overdrive and just being willing to run at a higher rpm for more power. Maybe that will also help the fan run a bit faster, and higher speed will help airflow over the radiator as well. I'll post an update and let y'all know how it goes!