i think the biggest problem concerning jester is the vet speed. It should be changed from each 3 kills to each 5 kills.
A fast jester can't be stopped by land. If you have 1 int shooting the jester, but there's lot's of engies in your base, the jester will get hp from vet faster than the interceptor will shoot the jester.
Euhm i'm not sure to be clear here xD