ThermoStasis

I live and fly in Florida. Summer months small cooler could not get the job done, so large cooler combined wth the thermostat together they maintain close to 205 deg F (measured after the cooler) year round in all temperatures no matter how I run the engine/airplane. I don't have to wait long for warm up or have to tell ATC that I need to stop and or decrease the climb to let my oil cool, I fly in some busy airspace.

96C - very nice oil/coolant temperature to have in cruise.

In the Australian summer, my Rotax 912ULS (no oil thermostat) takes roughly 6 minutes to get to 50C - it will take longer in our winter, may be 7-8 minutes. I use this (low RPM) time to work through my pre-flight rituals/tests,  taxi to the run up bay - works for me & my engine.

I accept/understand that liquid thermostats are a desirable (even necessary) accessory in areas that experiencing extended periods below freezing but otherwise, cant see the benefit (faster warm up) out ways the additional cost, complexity, weight & risk (all those extra joins = failure points).

A thermostat is unlikely to improve your oil/coolant cooling - this is all down to the heat exchangers (radiator/oil cooler/barrel fins) performance. Your installation of a larger/more effective oil cooler has addressed your operational needs - good job!