Tighter Shift pattern?

Have not been on the forum for a while .... I thought there was a specific place for Gen I Busa's so I apologize if this is in the wrong place.
Wondering if anyone knows how to make the shift pattern "tighter" on a busa?

I am using a Busa engine for my 3 wheeler and I am have a heck of a time getting solid shifts with a manual shifter. It seems the distance from 1st to 2nd and so on is long.
Meaning .... I want a minimal "tap upwards" to get the bike to shift. If you can imagine... I am in front of the engine, sitting down with pedals like a car. There is a manual shifter to my right with a cable on it.but I can't get enough "motion" to get it to shift. I am wondering if there is a way to make this tighter/smaller.

An Evo Shift star might help a bit if it's smaller in diameter than the OEM shift star on the Hayabusa. I think it is. I can't recall where but seems to me I saw pics comparing Evo to OEM.

For my ZX-14, the Evo diameter was the same as OEM and no real reduction in shift pedal throw.

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