I have two Vandas in vases, and i had a similiar problem.
What I've done is use some garden wire to hook round the basket, and round the vase rim so that it can hold the plant higher up in the vase.
I would leave the roots alone
The roots on mine are starting to reach the bottom of the vase, once this occurs no water must sit in the bottom of the vase.
To be safe, in the evening after watering, tip out any excess and it will be fine. If you water them in the morning it should have dried by night anyway