My daily farming event is the 4 lap LeMans driving the F40. (Classic Ferrari, #21.3).  I keep track of my best 50 times. 48 were 1st's, 2 were 2nd's. On average, I finish in 14:57 and the #2 car finishes in 15:03 so it's seldom close.  

In my 1st race after the v5.1 update, my 14:59 was only good enough for a 3rd place, with the 1st place car finishing in 14:53.   Coincidence?  Anyone else getting tougher competition?

[Edit:  Ran the race again and my 14:50 was enough for a 1st, only 2 sec ahead of the 2nd place car.]