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the only thing you can do based on your criteria is ensure it it perfectly aligned.
I believe member jbauch357 has a post in the archives on the procedure...
IIRC I found it searching for the anti venom mod.
Based on your post have you tried the C6 Z06 shifter. It is much better than the stock C5. I have one installed on 03 Z and like it a lot. Very smooth no vibration and shorter throws. About 200.00 from Gene Culley on the forum. Good luck