Light: It is unlikely that sunlight through a clear window will be too intense in winter in Idaho. To be safe though, if it is a south-facing window, place it where you want, then touch it to feel the leaf temperature, especially near noon. If it feels warm, move the plant back, out of the direct sunlight.

Pseudobulbs: There is no way to know if your plant is supposed to have ridged pseudobulbs, but don't worry about it. Use any changes as indicators.

Air Circulation: You want gently wafting, not a fan blowing on the plant. In fact, considering the likely dry air you have this time of year, I wouldn't worry about it at all.

Humidity: You'd be better spending your time and money trying to keep the house - or at least that room - at about 50% RH. Forget "humidity trays", as there is no way they can do so adequately.

Repotting: My normal rule-of-thumb is to allow room for one new growth to extend outward toward the pot wall, plus 1/2", but only repot the plant now if it is at risk of problems. The best time to repot is just as new roots are emerging from the base of new growths. If that is not happening, "baby" the plant in its current medium until it is - barely moisten the medium, rather than flooding it, for example.

Hydroponics: Don't go there now! The "best time to repot" advice holds doubly true in this case.

Roots "tailor" themselves to the environment into which they grow. Once grown, they cannot change. Move the roots into a new environment upon repotting, and the existing roots are immediately suboptimal for that new environment, so will begin to fail. (That's why we want new roots to be emerging, so they will be optimal, and support the plant.) Moving a plant into hydroponics is a very big change, so existing root failure will be faster.