Great work, Tim. Missed the fun earlier in the day cause I'm in Michigan for a grandson's first birthday.
As John indicated, convergence is something of a skill to be developed. Keep at it. As I see it, what you have will produce a good picture, but there is also room for improvement if you want to spend the time. As for the blooming. Join the club.
I suspect that RCA/NBC showed off the Model 5's on Jan. 1, 1954 in a dark room to avoid the blooming thing and probably to eliminate reflections from all that glass. I've used a regular '70's-era degaussing coil on the 15GP22 but couldn't notice any particular improvement. I've noticed the resolution of the picture improve as convergence improved, as you would expect. But it really looks impressive, particularly when the source is a live sporting event shot with hi-def cameras, perhaps because, as old-tv-nut has indicated, the hi-def system standards specify camera matrix characteristics.
It's back to NJ for me tomorrow.
Pete