I really waited with my feedback until I have a good sample size, because I know how luck (or bad luck) sometimes can work.
It is also funny that you mention playing more at higher corruption, which would be something I will definitely do in the next few weeks, but I prefer playing all new builds first before diving deep into one or two specific builds.
But another user did state some simialr experience that I have with grinding at 100 corruption:
I really hate confirmation bias, but there might be something if people with higher corruption farming experience less of what I experience.
I did play one character to 200+ coruption already and it truely didn’t feel more rewarding, qutie the opposite.
I also double checked with my friend who I played some MP with and he also had a lot of Vessels during our normal monolith runs.
Right now I have several devloped webs with several Vessels.
I really hope a dev could bring in some confirmation here, if this is actually some weird bug.