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I'm not a hundred percent raw anymore, but I'm still vegan with a lot of raw food and I had the same issue. I started taking digestive enzymes before every meal, and that has seemed to stop the bloating, and even heartburn completely.
Sometimes it's a bombo combo - too many things or incompatible things together and it'll cause bloating every time. It would depend on what you're juicing if it's doing this. If you are tossing in the kitchen sink, or melons and apples all at the same time, try doing single juices for a while, or just simple: kale & pineapple with some lemon, or carrot, apple, celery. I'm sure others will have good and better advice, but this is what causes bloating for me - too many things or the wrong things together.