1. Seaside: Medium
Since this is the first challenge, the "first" challenge was to get used to the car. Its BOP is off, you have to handle it a bit differently than when it has BOP on. There are many areas where I was able to get a better exit than him. Other than that, don't let the Chicane of Death collect your soul, and you're a-okay.
2. Maggiore: Hard
Continuing on the first note from the first challenge, I found myself fighting more with the car than fighting with LH's ghost. However, because the track limits here are so lax, you have plenty of opportunities to build a gap on him. What made me rate this as Hard is how there are some turns where it's very awkward to take with this car, which can result in LH gaining on you.
3. Brands Hatch: Extreme
This one took quite a while for me to do. Getting the car to quickly rotate around the turns is really hard, and there are many areas where LH can easily can gain on you. This one took me about 4 hours to get diamond on.
4. Big Willow: Dark Souls
Where do I begin with this one. This one is like being sent to eternal punishment by an ancient Greek god. This one stressed me out so much, I blame it for getting me sick (I still am as I type this). On all but one turn, he is gaining on you. In my experience, YOU HAVE TO gain on him and get as close to/pass him at and just after turn 4 (
image for reference). Turn 5, he nails that turn, and depending on how you take it, he is either barely gaining on you, or he is leaving you behind. Final turn, you have to absolutely get it right, so you have to try to get it in a way to where he is barely gaining on you. This challenge took me a total time of
24 HOURS to complete. Good luck, and may the odds be ever in your favor.
5. Suzuka: Extreme
Suzuka is one of my weak tracks. There are a few turns (the last two that lead to the hairpin) where he nails it, so you want to try to be ahead of him before those turns. LH is slow at the hairpin and 130R, so you can gain on him there.
6. Monza: Easy
In all but 2-3 turns, you can have LH eat your dust. You can easily start to gap him as early as the first chicane.
7. Mt. Panorama: Hard
There are some areas where LH is slow, but I think the main problem is that this track itself is hard, especially the downhill part. I changed my brake balance for different parts of the track, and it seemed to help me. Going uphill, I was on +2, and when you are on top of the hill, go -1 before you go downhill for a bit more stability. Then when you are on the bottom of the hill, go +2 again.
8. Interlagos: Easy
This one didn't take me that many tries to nail. There are a few turns where you can take advantage of the curbs. LH is also slow on some of the turns, so you can gain on him there.
9. Nurburgring GP: Extreme
LH is pretty good here. I tried to stay as close to him as possible, as you'll catch up to AND pass him at the final chicane. You can easily take advantage of the curbs at the final chicane, and all you have to worry about is not messing up the final turn.
10. Nordschleife: Extreme
This one is more of a Hard for me, but for some, they may find it Extreme, or even
Dark Souls. Unlike the other 9 challenges, you're in the Sauber (BOP off), and oh gosh, this thing is INSANE. When on 2nd gear, you cannot turn if you go full throttle, or you will spin out.
You'll be fighting with this car quite a bit, and if you don't know the track too well, you're going to struggle a bit. There are many areas where LH is a bit slower, so it's definitely possible to get quite a bit ahead of him (we're talking at least 1 second ahead of him). It's just that you're going to spend more time fighting with the car, than fighting against his ghost.
I'm 8 out of 10 diamonds so far and only .2 off at Suzuka and .1 off at Willow for the 100 mill payday and you don't really want to know how many times I have been ahead to stuff it on both of these combo's 
👍 will try some more attempts at the last 2 tomorrow 👍
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I usually need all the tips there are to achieve decent laps, so everyone's comments are most appreciated.
