The manual calls for float tabs to be "just in contact" with the needle valve when you take the measurement. Over time, the little springs in these needle valves compress and at some point become useless. I have replaced needle valves that have had weak springs.
I tend to replace needle valve assemblies and O rings in most carb jobs as they are often the first part to fail. You do not want overflowing carbs.
At the end of the day, I am not sure that the difference in measurements that you are talking about would have a material difference in the operation of your carbs under normal circumstances. Just imagine what the fuel looks like when you are going over bumps, swishing from side to side and the vibration from the engine is zinging.
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