Foliar feeding is less effective than root feeding, and as NYC mentioned, liquids coalesce and drip down to the medium anyway. Another potential negative is mineral buildup on the leaves, which can be damaging, and just plain looks bad.
No fertilizer will "cause" anything. Improper use might, though.
Orchids are very slow growers in the plant world, so their nutritional needs are far lower than other plants. Add to that the fact that most nutrient elements can be translocated from old- to newly growing tissue (Ca and B cannot, but are often in the water supply anyway), and it is no wonder that no effect is seen in a year.
Then there's the question about what the change actually is. The effect of a minor change in anything will be very difficult to observe, except over a very long time span.
Moving away from overfeeding still takes time to show results. In my own case, I am at the end of my third year since making the change, and I'm just now seeing the results pretty consistently.
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