For overclock users, maybe this help.
I mod my Switch to improve the heat disipation, upper to the SoC, there are two bad things, the first and most important, it's a plastic sticker (simulating copper on upper side) on the metal plate, I remove it, because not only not seems good conductor, its between two layers of bad quality thermal paste... so this is so negative for heat conduction.
I remove the sticker and put only one layer of Artic MX 4 between SoC and heatpipe, the Switch can reach the same temps (with more time than before) because the system regulate fan speed depend of SoC temperature, but disipate the heat more quickly than before too, on my opinion it's a good improvement.
The ram chipsets that are bellow the metal plate, don't have any disipation system on stock, put two thermal pads betwen chips and metal plate help chipsets to disipate heat atleast to the plate, and the metal plate to headpipe.
About the removed sticker... didn't know the reason why factory put it there... maybe prevent liquids go inside the SoC, but on normal conditions it's harder because have the headpipe there, but if you are paranoid about this you can apply a little layer of thermal paste on the borders of square cut on the metal plate, this help to prevent liquids and do contact between metal plate and headpipe, helping a bit the ram chipsets to disipation if you put the thermal pads.
If anyone know the reason about this sticker I whan't to know it, just because give me curiosity why they put it there making more harder the heat conductivity with SoC and headpipe.
After two months with this mod, my Switch still alive and still showing a little improvements, not only with heat disipation, it loads the same game more fast than other stock Switch (tested with Splatoon 2 and my son Switch), because my Switch didn't underclock like stock I guess thanks to better heat disipation.
I still having a doubt about ram chipsets, maybe isn't good idea comunicate with headpipe because SoC can transfer heat to ram chips, but for now didn't see any issue, maybe a person with more electronic knowlements can say if it's recommended or not.
I test the OC option of retroarch to see the diferences between OC and stock, but didn't for so much time, just testing things, but if this modification works better on stock things, should be better for OC too.
Unafortunally I didn't have images of the process, so can't make a tutorial, but it's very simple if you know how to replace thermal paste on PC or other devices, so I think isn't needed a guide for this.