I'm sorry you have found yourself in this position.
Just a few thoughts right off the top of my head...
Before you added any weight to the car, did you know how much the car weighed?
Did you know how much the counterweight weighed?
When you added 1300lbs to the car, did you add 50 or 40% of that weight to the counterweight? I've found several Otis counterweights at 50%.
Adding the additional weight affects more then your hoist cables and machine gears. What about your car and counterweight slings, rail bracket spacing, machine mounts, ect, ect...
This sounds like a can of worms with a exploration date from the 70s...
I'm with E311, always try to stay close to the OEMs original weight. It sounds silly but we hang the car and counterweight and use a dynamometer to check their weights.
