Everyone has some weaknesses, or exercise they hate. For me that is chin ups, and anything involving the shoulders.
Like what others said, I think you might be cheating a bit with the jumps. If it makes you feel better, I started the year on zero chinups. I've currently progressed my way to, 3x15 chinups, and force myself to do them.
If your serious about improving your chinups, and getting your technique better, I think you should invest in those bands I talked about earlier. You can also use them for helping you do dips.
Good investment IMO, it will stop you from cheating.
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