I have a double reverse four bar lift attached to a tray and intake. The two intakes roller start to bend out after intaking 5 cubes. I already added 5 rubber bands per side. The intakes are attached to the top bar of both sides of the lift and the two bars tend bend as well.
Have you boxes the arms?
The arms are not boxed but they are connected together in the middle.
Add a locking mechanism to hold it in place mechanically. We found this to work, although we have since gone back to fixed instead of flip-out intakes.