I raise hundreds of Yamamoto Dendrobium and have several times talked directly to Koch, the master grower at Yamamoto's about this.
Do not stop watering. I find that one good watering a week is about right.
Last year I did not have anywhere to keep them as I outgrew their greenhouse and they were grown with the Cattleya and got watered 2-3 times a weeks all winter. In spite of the excess water the plants did well and flowered on schedule.
This year the heavy rains (mine are all outside) are still soaking mine 2-3 times a week and will probably continue for the next 6-8 weeks.
Nitrogen is the problem and you should have stopped all nitrogen fertilizers about 2 months ago. Nitrogen will encourage keiki and result in less flowers or a plant that is growing twisted with keiki coming off the sides.
A really excellent grower treats his species Den nobile the same way, watering heavy once a week. That is his definition of growing dry.
His plants (he had two exactly the same) were about 5 foot and had about 5-800 flowers on each.
Water is not a real problem.
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