I probably have very similar conditions to you. I got a young plant of a Clowesetum and it bloomed after 3 years, and had approx. 5 bulbs, with the new one being gigantic compared to the previous years growth. It didn't bloom the year after but the bulbs were much smaller. I think it's because in the summer it went 3 weeks without water and in a dim place during my vacation. The same is happening this year, so next summer I'll probably take the plant with me to France since I don't have a plant sitter!
7h of full sun behind a south window is what mine gets, more or less. If I were to stick it on my balcony it would get less hours of sun than that. (west facing). Following advice I got here, every year I repot it with the lower 1/3 of pot filled with composted horse manure and the rest is sphagnum. Then top dressed with slow release fert and I water with fertilizer (dosage all the other orchids get) every watering.
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Camille
Completely orchid obsessed and loving every minute of it....
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