Just saying. Not judging.

I've driven my car for 15 years with the spring plates adjusted.

I was chastised near to death by a Porsche Indy shop owner in Asheville, NC for even thinking of touching the elliptical bolt. I'll spare you the discussion but I was feeling small and had to really talk fast to let him know I was only a partial idiot.

What he said, and I got no reason to doubt him, and it's only one professional's opinion, is that they (plates) should stay in the middle unless you really know what you are doing with respect to setting up the car and plate adjustment should be done for high performance driving and not for street appearance.

Said to lower or raise it, index the t-bar only

No way man. The whole purpose of having adjustable spring plates is to make adjustments. Get them close with TBs but fine tune with SP adjustment. Street or track. Imho of course.

Beat to death,
A manual is worth its weight in gold.
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That's fair as I have heard the same going both ways. I did it for the first time based on Wayne's book. The change in ride height was very subtle but all that I needed.