A.G.
It is worth cutting the dairy! i promise! dairy really isn't a good source of calcium anyway, although the dairy industry has worked really hard to make us believe this. dark leafy greens are a much better source. my sweet son was also very gassy at this age and this is what helped us;
a. gripe water. available all over the place. an herbal alternative to gas medications
b. cutting out dairy, brassica family foods (which you have already done) onions, garlic, chocolate
c. rubbing castor oil on his belly before sleep
d. we found that both knees into the belly lifting butt into air a bit was much more effective at getting farts out then bicycles.
good luck!