That seems like a minimal difference when you split it for each side. I'm surprised the small amount of change makes much of a difference. Glad the change allows you to use preferred gears.

I've experienced improved shifting on 9 speed triple Campy Daytona group by correcting the chain line. The custom bike built at a reputable shop on a Franklin Frames frame, had a too long Shimano cartridge BB. Luckily the correct Campagnolo sealed BBs for triples are readily available for good prices. The shift to the large chain ring really improved even though the chain ring is a replacement and doesn't have the shift improving pins like the original Campy ring.