Tried asking around at shops here in town and Vancouver and everyone was a little stumped. Best recommendation I got was to swap out the 6CU6 and 12BH7A.
Found that one of my 6CU6's had gone south. Unfortunately in doing so no real change happened so I went back to fiddling with the controls. At this point I discovered that if I looked closely and twisted the width control from end to end there was something like 8mm of movement so it's less that the width is not working at all but more that it's really weak.
Further testing quickly halted when I cranked the vertical linearity and C-434 burst into flame. Looks like an arc popped through the casing and went into the ground clip that it was resting against. Set still seems to behave but I'll have to swap the disc cap out anyways.