Good to see outside temperatures occasionally above freezing!
Further thoughts on this:
1) Going with a half-size rad could obviously be a bad idea for any Miata owner who drives the car hard, tracks it, or lives in the mountains. None of those apply to me.
2) I'm also going to delete the A/C, which means removing the condenser (aka the second A/C radiator which sits directly in front of the engine radiator) which will improve airflow to the smaller radiator.
3) All planned ecomods will reduce engine load further below stock, reducing cooling needs even more.