1. IF is not completely removed by juicing. A juicer shreds veggies and some of the shreds are small enough to pass through the sieve. One way to reduce the IF is to peel veggies before juicing. The skin of a vegetable contains a high amount of insoluble fiber. Also, some veggies are high FODMAP foods such as garlic, onions, legumes etc. Even if these foods were juiced it would not remove the FODMAPs. For more information on FODMAPs read the first three links in my signature.
2. I am very sensitive to foods with lots of insoluble fiber. My vegetables are restricted to well cooked and peeled carrots, potatoes and zucchini as well as roasted peeled red peppers and tomato paste. I eat as much of these as possible each day and I have done so for more than a decade with no ill effects.
While Heather says the if you eat a good soluble fiber base you should be able to eat more insoluble fiber foods. I have never found this approach works for me. I do however only eat vegetables that have at least equal amounts of soluble and insoluble fiber.
BTW - digestive enzymes may not be of much benefit. Enzymes are proteins and many digestive enzymes cannot survive the strong acid in the stomach. Except for disease our bodies produce all the digestive enzymes we need. In case of disease like lactose intolerance an enzyme like lactase which can survive stomach acid is useful. It is best to choose individual enzymes for individual reasons and only digestive enzymes that are know to survive the stomach acid or else it is just a waste of money. For more information check out Go Ask Alice at Columbia University and the article Enzyme hype gives some people a headache have good write-ups on enzymes and digestive enzyme supplements. I believe I directed you to these articles once before.
Caffeine containing foods (coffee, teas, etc) and high fat or high lactose foods like ice cream are strong GI stimulants. If you eat them once in a while then be prepared for a couple of days of discomfort and perhaps pain after you eat them. I find it best to avoid them completely
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Re: A few confusing things....
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