Two comments on feeding:
1) Orchids are slow growers, so need far less fertilizer than do most other plants.
2) The concentration you apply should be determined to a large part by the frequency of feeding, and probably should not exceed the rule-of-thumb of 100-150 ppm N weekly.
I feed at roughly 35 ppm N at every watering. This time of year, when the sun is bright, so there is a lot of growth driving force, I may water my greenhouse 3 or 4 times/week, resulting. If I used plain water most of the time and only fed weekly, I'd probably go for 100 ppm N.
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