I struggle against lights with the sa1216, Looking for tips and advice.

I always seem to die in a 1v1 against a light with just the sa1216, if I use the winch claw with it ill win the fight but if im just using the sa1216 ill lose, Against H and M im good with it I usually win most fire fights that im in. On the Wiki it says it can 2 shot a light however even if i land 4 shots on them it leaves them at half hp.