New to zygopetalum, so many questions!

[Kaibiesaur]

I recently purchased my first zygopetalum, it is in spike with buds about to bloom. The roots of this zygo are very healthy, but have begun to overgrow the pot I bought it in. They are literally overflowing from it. Is it a good idea to re-pot this, or would it be better to wait until the flowers are gone?

I have decided to place it by a South facing window, with a sheer curtain, but I am starting to worry about it recurving too much sunlight. The leaves have tiny brown spots, but they haven't increased since I put it there. The sheath under the blooms have began to brown. My worry is that the exposed roots may be drying too quickly.
Does anyone have any words of advice or anything that could help me? I really love this plant and I want to make sure I can keep it as healthy and happy as possible.