For your cascade lifts, what type of knots are you using? I originally thought of constrictor or taut-line hitch but those didn’t work so I simply triple knotted it and it seems to work. Another problem is the the lines are not taut shown in the image, is there any way to make them taut without making the knot loose?
What has worked well for my team is threading the string through a spacer and sandwiching the string between the inside of the spacer and a screw, then securing it to our lift. It depends on the string you have, some string may be too thick. However, the threads on the screws grab onto the string, making it super secure.