scifisam
feck! arse! girls! drink!
You sound pretty knowledgable on this.
Is it an issue if you get slightly *too* vaccinated?
I don't think so, especially since most vaccines these days aren't live.
But there is always a risk with any vaccination. It's usually a minuscule risk but for adults who might well have been exposed already it's not a zero sum game because they're not going to pass on the infection anyway, unlike unexposed kids. Even a few days off work with a vaccine-related fever (which is not common but also not that unusual) could be difficult to manage. So for, say healthcare workers, who probably haven't been vaccinated against chickenpox, it can sometimes be worth checking for titres rather than going straight to a vaccination.
I'm not that knowledgeable though, just another person on the internet.