Generally speaking, and by design intent, a thermostat does regulate minimum coolant temp.
But if the cooling system has enough capacity & flow capability, a cooler thermostat can bring operating temps down.
I did that on my Dually, and it definitely runs cooler.
That said, it also has an added ATF cooler and its factory oil cooler.

I forgot to add in a previous reply that water rejects heat a bit better than anti-freeze.
If the OP's climate allows it, I'd also drop the anti-freeze ratio to 25%.
At the track of course, no anti-freeze.