Those who pay for engine overhaul themselves should probably invest in a CHT/EGT display with individual cylinder information, a technology that has been around for decades and even shows when the first cylinder has reached peak EGT, etc. The guys who refurbished the Red Bull DC-6 have three of those per engine....
On the long run we'd better move to engine technology where this is left to electronics. We don't build new cars with chokes for quite some time already.