Zygopetalum help

[Cranly]

My zygopetalum just finished blooming, so I figure now is the time to get it some help.

First - the lead bulb is right up against the side of the container (pic 1), so we will need to get a repot
- do i need to divide at all? in addition to the lead bulb, it looks like I have 5+1 tiny one. I think i read you want 3 in addition to the lead bulb. I have no desire for a second plant and would just as soon leave the whole thing whole, unless you think separation would help.
Just a bigger container? or try to shift the whole thing within the container?

Second - black spots on the leaves. (pic 2)
Early on I wasn't careful with my watering and would get it on the leaves. Lately I take more care and don't get it on them, but I still have some black spots. I probably don't have a ton of air movement in the room, so that might be causing it? but let me know if you have thoughts otherwise, or any solutions.

I feel like overall the plant looks a bit dry, but if anything I often feel like i'm overwatering the plant. Maybe I'm wrong. It gets at least 1 watering a week; it's been rather humid the last several months.

Thanks for any advice