When all the money goes in and you are more than 50% favorite, even by only 0.5%, then your play is correct.
Bad luck does not exist. It's called variance, and to eliminate variance you play more, not less.
If you put your money in as a 70% favorite 10000 times, you will win very close to 7000 times. No secret, no voodoo. You still loose 3000 times, and you have to accept it. That's poker.
Download pokerstove (free) and enter your hands in there. It will tell you what is your equity in the hand, so you will know if you made the right play. Do not just enter the exact hand of your opponent once you know it. Enter the range of hands that you think he may have according to his tendencies and the plays he made so far. Check if you are a favorite against the range. Also take pot odds into account. 50% is not a magic number. Calling an all in is dictated by comparing pot odds with your equity against the range of your opponent, not by whether your are > 50% favorite. See here.
For you last question: you should consider going away from the table after winning if players with stacks of size comparable to yours are sitting to your left. They have position on you most of the time, so they have an advantage on you. Generally speaking, you want to have position on players with big stacks and have short stacks to your left. Also good to have loose players to your right and tight players to your left.
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