the cpu being above docked speed doesn't mean is overclocked, its actually downlocked to run at 1024 mhz. Switch cpu is binned at 1725 mhz, it can run perfectly fine at those speeds WITHOUT ANY ISSUES
that said, when playind docked the system is hotter because is using way more gpu than dolphin, and the gpu is the main heat income of the system
if for you having less batter life in a matter of years is "damaging your switch" (lol), you can always use dolphin DOCKED OR CONNECTED TO THE CHARGER. and that's that, ur issue is gone.
--------------------- MERGED ---------------------------
oh cmon, lets be smart here. overclocking doesn't work like that, if it is stable and its not causing any heat, it wont magically damage ur soc because you went further in clocks, specially if its up to the native tegra x1 speeds (even if this variant is not binned for that)