These latest DLC tours are way too easy. The only race I've found challenging is the endurance one. That was perfect difficulty-wise.
Feeling a little disappointed if I'm honest. Being out in front for the majority of a race with little challenge isn't very fun. I'd give my left nut adjustable AI difficulty.
For me as a casual the difficulty is about right (Sakura pack really was too easy). But I can easily see how people with a little more skill will just breeze through the DLC without many problems.
Finally my right arm is in a state that allows me to play a bit again. The last 2 DLC packs have been pretty nice so far, I like that there are finally some new challange types and longer races.