So, that tube was shot. All of the plastics were brittle, And broken, the tube was always blurry no mater what adjustments I made, and I could never get convergence right.
So I went with a tube swap. Found a Sharp 25in 25R-S100 locally (40 min drive) for $20. I opened it and found an RCA A63ahc26x tube in it. Tube was a perfect drop-in replacement.
New tube with K7000 Chassis:
Had to cut the yoke connector down the middle
And plug in the left-half backwards (vertical wires)
I need to do some color adjustments (everything’s is a little too red/purpley), but I’m very happy with the replacement.