Rescuing a storm damaged V. Banjong 'Blue Sky'

[Dusty Ol' Man]

I picked this vanda up at Lowe's and it looked healthy. We had to evacuate from Hurricane Laura so all the plants went in the garage for a few days. When I returned, they all came back out onto the deck. Everything was fine until 6 weeks later when we had to evacuate again from Hurricane Delta. In my rush the vanda was left hanging in the tree. When I returned I found my poor vanda had stayed put, but was beat up pretty badly. I cut out some of the dead roots, watched the damaged leaves and removed some that were too far gone. I found locally some root stimulant hormone and mixed up a small quantity. I have been soaking the roots and lower stem in this solution for a few days and am starting to see some new root growth. The poor thing still looks a bit dehydrated in the leaves. After soaking for a half hour most of the roots are nice and green. Within an hour of removing from the bucket the roots are white again. Should I increase the time in the soak? I don't like the idea of using tap water, but have a rain barrel. The temps the last few days have been between 65 and 85 degrees F and the humidity between 70 and 90%.
Edit to add: I tried to post a pic but the software won't let me.