I don't have the prowess to get a gold on the Trial Mountain one-lap, that Mazda RX car is hard to keep in check, it either spins out way too easily or it understeers like crazy in crucial corners. I am three tenths away from gold, after numerous tries. The demonstration ghost is wicked quick, and I'm struggling with the Dualshock controller.
I don't know if this can help somehow, let me post what I did just earlier today to get gold (Controller, motion steering, TC off):
Keep 5th in straight.
Don't brake at the esses, just lift and coast a little on 2nd and 3rd corner.
Inside the tunnel go down to 3rd and floor it only when it is straight at the exit.
The right hander after the tunnel take it with 2nd.
Next right hander try to keep 3rd, also for the left between the tunnels.
End of straight, brake just after the curb starts, keep 3rd coasting, again floor in a straight line.
The next part is tricky, I lifted momentarily for the right or else the Mazda oversteers and brake just before the crest, going down to 2nd for the right hairpin.
For the left hairpin I brake just after the crest, or else it overshoots the corner.
For the final chicane, brake just after the curb starts, keep 2nd for both corners.
Hopefully the above gives you sth different to work with in your pursuit for gold.