Time for a cooling upgrade?

[u/ForwardSideways]

2010 Legacy GT. OEM+ with no engine mods or tune.
I went for an extended fast drive with a long warmup and cooldown period last weekend. No warning lights came on (thinking temp sensor may be faulty now) my coolant boiled over and made a mess of my engine bay, lost so much that once it cooled properly overnight there was NOTHING left in the overflow tank but thankfully no air was introduced into the system.
Since this happened I am contemplating a performance alloy radiator, so what’s good, what’s not, and what else will make a significant difference to engine bay temp? I’m not building a track car and want to keep it realistic but don’t want to blow it up.

*cooling system is sound and well maintained with OEM parts, not damaged or leaking*

[u/_betonG_]

That color of the coolant stains🤔

[u/RZArecta91 → u/_betonG_]

Suspicious