Found this thread when working on a young friend's H001. It was doing exactly the same thing, and could not be cycled slow at all. He had put several bricks through it before it happened. I don't even know the correct terminology, so bear with me. The raising arm that pivots off a pin and goes inside the ramp was ground at an angle. That surface contacts the inside of the ramp and acts as a stop mechanism. Because it was ground or fit at an angle, it was making contact on an edge rather than a flat-to-flat surface. Where that edge meets the ramp, the ramp area is only 1/8" or so, and it was slightly rounded to boot. The ramp contact surface was worn enough to allow the lifter lever raising arm to travel too far, pushing the cartridge up enough so when the cartridge leaves the ramp lips it is tilted up, just like in the OP's picture. Building that worn surface up and polishing the lever flatter fixed things right up.