Jony,
"(Example: I chose to drive a Ford Fiesta ST and the game gives a ghost of mine with a Ford Fiesta ST)" - this is not true, i played with Daemon against LF tuned and with Daemon against Charger in the same day...so, AI decide based on your performance on a track which opponent will be and if you have for example best time 48:05 s, AI will choose a past race of somebody else with a time that is usually better then yours (not all the time but anyway nearby)
Today, after about 3 months, i finish last race against Marcus with a Viper 920PR, was not easy ...
Now, i will stop play daily because is a matter of time until i will have all other cars at max and i don't care if this will happen in a year or 10 🙂))). SE are very easy now and not worth to lose time with them, maybe if there will events for a better car then CCX. With BRR strongly dependent on AI is nothing else in this game for me.
All the best.
T0rmi