I did a group C race and here is the result of my efforts to balance the class (ignore the newer GR1 cars in the photo). As I have said, less is more when it comes to Sophy. I tried to balance things with full/more power, but the results were consistently disappointing.
So, here is what I have found to be the best. Reduce the downforce to minimum front and rear (500/1000). Then, use the power adjustments to get the power to 550hp or less (540 for the 787B). Then add weight to get the cars to 800pp.
The racing is closer. Sometimes too close as I have seen Sophy get into accidents. The 787 remains a straight line beast. You can give it more ponies if you like, but it might walk away from you at LeMans. I underestimated its pace at a test and it was 10 second ahead after three laps. Could I have closed the gap with time? Maybe, maybe not. I decided less power was a better precaution.
Also, side note (this is more for people coming to this thread for the first time), I have confirmed that the Sophy setting are COMPLETELY broken (in a good why, so I hope they take this into account)
How are they broken?
1 - When setting the boost levels, the prize money decreases. This indicates that the boost was intended to be applied to the player, not Sophy. However, I have done time trials and compared my TT times to my fast laps in the Sophy races. Despite the advantage of draft, I consistently set the same or better time in the time trials, which would indicate there is no boost on the player in the races. That means, Sophy is definitely the one boosted (or restricted less) and It appears that boosting Sophy was
not the plan. THANKFULLY this happened because it's WAAAAY better this way and I hope it remains this way FOREVER! PLEASE PD, NEVER FIX THIS
2 - The settings are (top to bottom) Boost Strong, Boost Weak, No Boost. This is also incorrect and I found a consistency to it. It appears that the actual effect is (again top to bottom) No Boost, Boost Strong, Boost Weak. So, the settings are offset by 1
In other words
Boost Strong = No Boost (AI drives at about the same pace as the base AI. I consistently finished these races with a larger gap to second when compared to the "Boost None" setting)
Boost Weak = Boost Strong (The AI is lapping around your pace. The best choice IMHO. I have some one make races that are near impossible to win when starting from the back).
Boost None = Boost Weak (The AI is a bit better than the base AI. I can win consistently on this setting, but it is a bit of a challenge.)
Of course, race balance is a key component.
The work (and credits) involved in making these races likely spooks off some people. So, hopefully, these tips will help make it a little easier.