Having finally played as the Crossroads noble, reducing HP and increasing HP on kill seems like a very good direction for noble balance. I kept running around looking for people to kill so I could keep my HP up, instead of hiding in the cart or other place. The moving wander area also may have helped, but I was mostly focused on that HP on kill and just the fact I can knock people over with just a fart.
We're trying out some changes to the nobles with the upcoming update. We're taking this gradually, as we don't want to super-overtune the nobles.