Really need help with Jax (jungle)

I'm not sure whether you can (I'm pretty sure you can somehow) check my match history but can you guys give me help with Jax? I've played him 7 times in the past 2 days or so and they're all losses (well, there was one remake). I'm playing to the best of my ability, somehow ganking more and farming more than I usually do with my normal jg main Lee (I've given up on him now).

I just can't win somehow no matter how hard I try or how good my KDA/CS per game is etc

I'm aware that my build is perhaps too similar every game and it's a bit on the damage oriented side but other than that I'm at a loss..pun not intended

If I need to do something in order to have my match history visible please do say