Torque wrenches are the way to go.

You can also go the other way, too loose, and it'll make your car feel like all four tires are fighting each other in the road curves. Don't ask me how I know that! It is so simple to do it right and so stupid to have it wrong.

I too have noticed how sensitive these cars are to tire pressures, you can really feel it. Mine seems to feel better at the higher end of the pressure scale, and the ride feels better too. Not so on my chebie Impala, it likes softer tires, and rides like 2 ton truck on a rocky road with higher tire pressures.

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Mark
1983 300TD Wagon
Even a broken watch is right twice a day