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What makes the synchros so sluggish?
Recommend you give this lube some time bfore experimenting further. No MTL gives a perfect shift so there is no MT nervana.
What or how do you define sluggish synchros?
The shifter fork slides gearing forward and backward on a shaft. If the oil film is too thin, you will get a bit of stick-slip as it moves, giving a drag feeling.
If the oil fim is too thick, there will be a feeling of resistance to motion of the shifter shaft.
The FM makes sure everything is spun up before actual engagement, which reduces wear.