When transition to SH does not go smoothly

[SundayGardener]

Hello,

In general, all my transitions to SH have gone really well. So well that I just kept moving more and more orchids to SH.

I do have 2 that appear to be dying. I'll post pictures later. One is a phrag, which was healthy. After moving to SH, leaves started turning black (from the bottom) and falling off. This seemed to have slowed down briefly, but has started again. There aren't many leaves left!

Then I have a paph with similar issues.

My question is, what steps, if any, can I take to save these plants? I knew going in that I would lose a few, so I can deal with that, but before I seal their fate, I'm curious if there is something I should be doing. Drier reservoir? More frequent flushing? Somehow treat what looks to be rot?

I used Innocuor and KelpMax for the initiation transition, and have used monthly since then. They get flushed with RO or distilled water with fertilizer 2x week.