Hmmm!! Someone else with similar results as I have found.
So you want to tell your fellow Texan know it all that a rear seat bottom and fr sway bar isn't exactly removing a bunch of weight that would affect times in great amounts.
Sorry I have to go there sometimes.
I am doing similar to you. Today it was supposed to rain in the afternoon. Which it did. So I had my stock tires with me for the drive home, thankfully. Last weekend I didn't, and will not be getting caught again in the rain on purpose.
I remove the rear seat bottom or the whole seat so I can carry my wheels. I don't really lighten the car for performance as much as comfort and convenience. Also to try different things. It's probably why I have been able to avoid the mod bug for so long.
As for the Incognito that will be tested at some point. I will let you know when I do.