Note to self: When you start getting the weirdest namespace errors while porting a service to a new runtime version, make sure you are editing the config files for THAT version of the runtime, not the nearly identical ones for the old setup you still have for comparison tests.
Plus, both the "clean" install and the IDE Plugin keep creating "default" files that they don't actually use... :facepalm: #it #itfun #itfail