Hello, appreciate your words, buddy!
I guess that the "creeping" motion comes down to both the car itself having a high-rev-oriented power output and the pit limiter speed being too low, i can make the transition a bit smoother but can't promise that would be corrected - i don't exactly think it is a "bug" or something to be necessarily fixed, but hey, if it's quality of life i can try something about it!
About the aero packages, apart from the official tracks from 2018 on, most of it's track-specific layouts are guesstimation (that's why i kept tracks such as Daytona and Talladega with the standard Speedway package), it is actually possible that i have an compromise about that as well, but then again it would be another kit created (i.e. I500 downforce with Speedway power) and that could get it quite convoluted, so i don't necessarily think it would be a positive thing long-term. Anyway, i think i finally nailed it on the physics side, so possibly that would be the last update dealt with (for the foreseeable future).
Cheers man, have a great day!