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Thanks guys, I'll try a couple of shear tabs between the hoop and the roof support, probably one on each side. Just yesterday I fixed a big rust patch in the dogleg which had been hiding under some bondo (nice job whoever fixed that last 😕 ) and that seemed to stiffen the car up substantially, no more banging when entering the driveway!

Definitely weld the bar to the chassis. A buddy of mine ripped the A pillar off of his car at an autox in the 90s. A fabricator friend fixed the A pillar and added a 4 point, then welded one single probably 3" x 6" plate from the bar to the roof right in the middle where the map light is. He said it made a huge difference, and all of the interior panels stopped squeaking when he went in and out of driveways, etc. People do this all the time now with shear panels that usually have dimple die holes on the A pillar of cages, but you can do it anywhere the cage and chassis get close. I have smaller panels on the roof, the door bars to the sills, the main hoop to the inner wall just inside the doors, and around the A pillar. I don't have pics of the top, but here is one of the hoop to inside of the door. FWIW, after I did this I learned about shear panels, and they really should be longer for better strength. Also doesn't have to be 1/8" thick. Thin metal does fine for this. .0625" is fine, .040 or .050 probably sufficient. Do some googling on roll cage shear panels and I'm sure you'll find more detailed info.