I have the same issue , I just bought 2019 model, which I am very pleased with, but when I park up it smells of oil or burnt oil. I have noticed some flecks of oil around the exhaust opening and it's beginning to look a little black. I don't use gear oil on the chain, the bike is fitted with a scot oiler but there are no signs of oil on the chain side of the cat box. Did you resolve your problem?
The bike has done 11k miles. I am concerned it's an engine problem pushing oil through the exhaust (rings or valve guide oils seals).
ps I don't reckon the clutch is slipping.