Quite frankly, you need to reconsider how you are gearing your system, or change your motors. Choosing motors and gear ratios shouldn’t be a random process. JVN’s Design Calculator is a great tool for preventing things like this from happening.
For example, if you plug your situation into JVN, you can see the problem. I took the liberty of setting your weight to 30lbs due to the likely drag in the system and the fact that, at least in my experience, everything is heavier than you think.
As you can see, your elevator is moving unreasonably fast, and the motors are being pushed to 30amps. This shouldn’t be enough to kill them instantly, but cycle after cycle, they will get hot and they will burn brushes. The second this system jams however, those motors are toast.
If we add another 2:1 stage however,
We half the speed of the elevator and we drop the 775 pros down to a safe 15amps.
Another thing you need to do with a mechanism that has the ability to stall 775pros is verify you have extremely solid limit switches. Those motors will burn our very fast (2 seconds at 12 volts), and if you don’t have a means of preventing those motors from running against themselves (a limit switch), you are going to kill motors like crazy.