Tom,
Are you using Brownell's bits? These are hollow ground for the screws, and will not bend. May break, but in this size no bend. There are sizes that fit the slot perfectly, both width wise and depth and size of the slot. I have a small ratchet that fits right over the bit, so it is very near the screw and all of the torque goes right to the screw with no twisting at the top. With an extension handle on the ratchet (small pipe) the screw is going to let go and turn out in I would say most all cases.
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