Hey Dasintex

First of all you should have set it up so full stick movement is used, instead of just half stick. I would say if you put long enough servo arms on it to work using half stick you overworked the servos. Shorten the servo arm length and use the full stick travel to accomplish the same task. Thats one thing to look at.

Second, the servos CAN NOT take 6 volt battery packs. You didn't say what you used so this is another area I would look into.

Third, the servos are not strong enough to hang the diver from and pull his own weight up like you are trying to do. The servos get mechanically disadvantaged with the arm setup (or long servo arms). The servos do have plenty of power to steer the chute even though they cannot pickup the divers weight.

With skydiving you really need to set up your skydiver as stated in the instruction manual, this will always help in the long run. I have jumped 100's of jumps with the setup shown with no faults. Hope this helps.

Dave