Indy washers instantly fixed that bushing fold issue for me.
I currently have 101a bushings in my 66s, they’re rock hard, and these are still my best turning trucks. It’s kind of odd actually. When I put the hard bushing into my other trucks, they don’t turn. There is a lot of leverage or whatever in these Aces, to turn with less force.
I hated my 66s at first. I was so pissed cuz I never had a piece of skate gear I had to troubleshoot so much. However I’m glad I kept trying with them, because now I love them, and just bought some 55s.