even if you remove them just to check them you may as well change them
what with the labour cost to inspect might as well change
also spark plugs have a washer where its a once use item, I know it sounds crazy but once removed you should replace with a new item, (manufacturer guidelines) as cannot guarantee seal
I agree that when they are initially crushed then that will be the best chance of sealing you will have - so technical data suggests that for reuse you use the top end of the recommended torque, which has always worked for me, but not really as the design of the original sealing intended.