| Orchids take in water and nutrients through their roots. If there are no roots on your Cattleya, the plant is not taking in any water, which could be one reason why your plant looks dehydrated even though you are being disciplined in your watering habits. Increased watering at this point won't affect the plant because its mechanism for taking in water is gone. It cold be sitting in water and still not be taking any in.
How are the new growths coming? Growing any new roots yet? Another possibility is that new growths use up nutrients and water so the plant could also become shriveled as the new growth uses energy reserves from the rest of the plant. The solution may be as simple as doing nothing ans allowing the plant time to grow new growths and new roots.
Not being able to actually see how shriveled your pseudobulbs are makes it difficult to assess how dire your situation is. At any rate your plant, being without roots, has suffered a setback and it will require some recovery time. that may mean you loose back growths, pseudobulbs and leaves, it may mean that the new growths are smaller at first until the plant has grown a viable root system. I'm not trying to be pessimistic, just trying to let you know what you might expect.
(As a side note, some of you may have noticed that overwatering and underwatering an orchid produce the same symptoms, namely the appearance of dehydration; the overwatered plant begins to loose roots thus reducing the amount of water the plant takes in; the underwatered plant simply doesn't have enough water available to take in. In both cases the plant takes in less water and therefore looks dehydrated.)
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