Yes the competition sway bar attaches as you described

The one on my car is from Addco: the attachment is similar to the front, sway bar bushings on the chassis with the sway bar ends clamped on to the springs.

The car does have the traction arms; they attach just under the front shackle on one end and directly under the axle at the other.

It is possible something is binding but I don't thinks so based on past experience. I've driven a couple of RX7s that had bind in the suspension, they snapped sideways and needed opposite lock to correct them. My showroom stock Miata in backed corners would corner on the bump stops and it too had snap oversteer.

In car the 1200 is not that tricky at all from my point but outwardly it looks like a bike with worn swing arm bushings. The video does make one thing clear in my mind; this is what's causing the odd ball rear tire wear I posted a while back.

I have the car up on stands so I can yank the motor out, so we'll be going thought it once more. I'll likely try and fit a panhard but want to check everything once more. While I'm not losing anything in the corners obviously fixing this should lower the lap times.........or not.