Mismatched differences between your ears/speakers by an inch or less should make no significent difference. If it does your should pick it up in hearing a slight shift in the stereo imaging towards the speaker furthest way. But that is only with your head in a vise. Moving your head about, or shifting in your chair, will cause a greater shift than that.
Rather than concern yourself with such minor differences in distances, you might re-direct your energies in perfecting not only the direct sound, but the sound reflecting off the walls, ceiling, and floors. And fine tuning your toe in. Doing so will improve your sound much more and will certainly challenge your OCD problems. This can keep you busy fussing around for years.
FWIW, IMHO, Exact measurements in speaker/listening position set up can be useful in initial set up IF you just happen to know what measurements should be, but can also be detrimental. Exact measurements can cause a reinforcement of nulls and nodes which are potentially problematic.
Get OCD about your sound, not exact/balanced physical measurements.
Rather than concern yourself with such minor differences in distances, you might re-direct your energies in perfecting not only the direct sound, but the sound reflecting off the walls, ceiling, and floors. And fine tuning your toe in. Doing so will improve your sound much more and will certainly challenge your OCD problems. This can keep you busy fussing around for years.
FWIW, IMHO, Exact measurements in speaker/listening position set up can be useful in initial set up IF you just happen to know what measurements should be, but can also be detrimental. Exact measurements can cause a reinforcement of nulls and nodes which are potentially problematic.
Get OCD about your sound, not exact/balanced physical measurements.