I am not being thick but try to analyze the effect to pick the cause.
In specifc car, like rear engined RWD with very light front you will get weight shift and understeer with locked front wheels and heavy throttle.
Please start LFS, press F and look at forces. Get FZ50 with soft, grippy rear and stiff (rebound especially), ungrippy front. With such understeer setup you should achieve the result.
Jack, wait until the end of the current 12 week season so you can see schedules which are going to be used for the next two seasons. Watkins Glen though is on basically every schedule, Mid-Ohio is a cost effective buy as well, but ultimately it depends on what cars you're buying and where you intend to go.
Have you guys been watching the iracing dwc road races on psrtv? I haven't really followed it this season but on the last season some of the races were pretty good to watch? So have the races on this year been good? Which ones would be worth watching? http://www.psrtv.com/archive/index.php
I've only watched the opening rounds in watkins, zandy and indy. I'm downloading road america now but I have no idea if it is worth watching.
If you go here: http://www.iracing.com/live/ you can view a stream of previous races by clicking on archive, so you don't need to wait for them to download. As for which races are best to watch, they are all fairly equal in excitement tbh.
Here are my pics of my cars what I have driven for a while now. They do have nice tracks, lot of drivers and always awesome clean racing.
I recommend especially Star Mazda, would like to see you on track!