[Nonfractal]

Have a look at this thread. 
https://slotracer.online/community/showt...ht=Newbies

I would say you are overworking the car setup before it has even seen a track (while in your hands)

The best source of info will be the guys that are winning at the track you intend to go to. Buddy up to them.
Most racers are willing to help the newcomer, it's only when you start snapping at their heels does the flow of good advice dry up.

You can not trust that the basic car will  be "ok" .
The car might have been shelved for a reason. 
Get the car onto a flat plate and make sure the basics are right before putting  time and  money into the car and worrying about advanced setup.

It is possible to set cars up without having a test track.
I'm not a home racer, just a club racer. No home track to test.

With the right tools and prior knowledge of similar cars on similar tracks , you can get the car 95% of the way to its optimal for a particular track, but only track testing and laps ( on that track ) will get it to 100%

AlanW