Had the same problem with a vanda I have growing in a slatted basket.

The air here in my area is so dry that most vanda spikes would dry up in a matter of weeks before reaching maturity. It wasn't doing much so I repotted with large bark chunks and charcoal. It gets a quick watering (not thorough like the others) every morning.

Can't afford to mount or hang anything because I'm not home to maintain the daily spraying. If light is an issue, artificial lighting is another option.

Trung