Reading older material have been working on applying stressors then giving obedience while under stress.
Seems to so far be working.
Ace had his first experience with a spiral staircase yesterday, when he got too stressed I had him do a sit and down on the stairs as a breather. Afterwards he was less stressed about his descent. And later I had to keep him away from them.
Also does well walking a lattice on incline.
First video is his first time. Second video below is today.