I guess Vandas are amongt the most difficult orchids to grow in temperate climates but they are not impossible to bring to bloom. I hand my vanda on glass vase and leave some water on the bottom of the vase ( roots must not touch the water) and give it full sunshine in the summer time. here is the result. hope you like it.
I've not tried the vase method although many are sold that way from the nursaries I've looked at. My sanderiana based hybrid is grown potted and it seems happy... well it developing buds at the momment so I guess something is right.
Glad to see you are having success, I might try more next year and maybe get one in a glass vase.