Personally I have had a great week so far, gaining ~8k DR, just in time for the last round of the manufacturers cup.
When I saw this combination as a future race on Friday, I made a lobby to practice it and for fun which may have helped, and in those races I adhered to championship track limits which turned out to be the right decision... So on Monday morning (I had the day off school) I was doing pretty well, so I would strongly recommend doing that if you know you will play on Monday (especially Monday morning).
In terms of the track limits, from my experience Sector 1 is very strict, as is the chicane (T6 and T7). After that, it is way more lenient, although some kerbs in the hotel section are still strict. The last two corners are very lenient and you can go completely onto the kerbs without getting a penalty.
This is from my experience, it may be slightly wrong, but you can see overall that there is inconsistency. If you are struggling with track limits, this is probably why, so bear in mind that up to the chicane, the limits are very strict, and the last two corners are very lenient, if that helps.
This highlights issues with track limits very clearly, and I do not think it should be too hard to fix, but there's nothing we can do sadly. So even though I personally have had limited problems with track limits, it is definitely an issue for Polyphony to sort out, but if you follow my advice based on my own experience, that may help :)