Shifting too far in 3rd gear....?

Stopped power shifting now cause I'm worried that some times it may not get in 3rd & it will just fly up to 8-9 rpm, I have the rev limiter set at 7000 but I'm just not wanting to hear it grind if I miss. Although it sure sucks knowing you need to let go a split sec (to shift) and you know the guy just passed you cause of that ... And with an automatic screaming on top end he just needs to hold on to his wheel.
Don't know maybe it's age, thinking of going to automatic and just letting it go with a loose converter and no worries missing 3rd ⚙ ....
Some cars used this spacer which goes between the shifter and mounting plate. This might be enough to give you the clearance that you need.

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