It sounds that you need to replace springs. It is kind of dangerous, if you do not follow the instruction properly. If you are not handy, please contact professional shop. I replaced mine years ago by myself. The spring set costed about $70/set, was ordered on-line.
American Garage Door 678-225-5669 is not good company to select even the wire to the control wire liked snake line . I do not know how they are trained. never lube if do it cost more money.