SUN2000 KTL-M0 - recommended device power for PV 6720 kWp

One advantage of having headroom, is that the unit will heat up less. So if you can use a larger inverter, it should run cooler.

Even though the inverter is designed to work at those temperatures, there is a maxim in electronics that every 10°C raise reduces the life. So a corollary would be that reducing the temperature would reduce the possibility of failure.

Some power companies limit your exports, and some go to the extreme limiting your inverter size. If they only limit your exports, you could use a larger inverter and add a smart meter to keep your exports within check. This way you only reduce your production when you aren't consuming enough to be within the export limitations, not all the time.

On retrospective, I should had gone for a larger inverter. Though my local company added extra requirements if your inverter was over 10 kW, so that was my limitation.