Cattleya Dehydration and leaf yellowing

[kitanna05]

Hello,

I've lurked for a few months and finally worked up the nerve to post

I'm new to the orchid addic- ,I mean, hobby, and found myself originally drawn in by 2 struggling, mini phals brought home from a market. Severals phals later, I ignorantly decided to expand to a couple of Cattleyas. One "Better-Gro" Rlc Shinfong zlittle Suu Cluster Orange" from Lowes and one "Pot. Orglades Tradition Sunset" purchased and shipped from a nursery 2 months ago.

I repotted earnestly into some clear repotme pots, thinking that's what was responsible to check on roots, etc. as my previous experience with the phals involved lots of ancient moss blocks with dead roots that needed purging. The media is the same across both plants, a medium bark and charcoal mix sent to me by the nursery.

Both plants have put out new roots and seemed okay. "Sunset" had a tiny case of scale that I didn't even realize was happening on the pbulbs until I discovered a white oval on the underside of one of the leaves. I isolated and treated with isopropyl alcohol and from my observation, hasn't been seen again since. Pseudobulbs on both have always seemed on the wrinkly side, not plump.

This past week, I've watched the "Sunset" develop the yellow leaf and have been trying to search whether this is normal leaf drop or a larger problem. Scale again? Hidden scale?

Now I'm thinking my overall treatment of these babies is off, and would love some help. I'm thinking I overpotted "Sunset" (too deep of a pot?) If suggested to move or repot, can that be done safely with the roots she's put out already? Leave her alone? I've read that Catts like to dry out, so my watering was once a week for the larger and twice a week for the smaller but given that the leaves are not looking great, water more??

My stats:
-SW Ohio, growing indoor. Current room temps: Daily highs mid to upper 70s(F), sometimes just hitting 80 if outdoor temps in the upper 80s. Nightly room lows: mid 60s.
- RH: 50% average; overhead room fan on 24/7
-Grown on open Ikea glass/metal shelves with full spectrum T5 LED lights: "Sunset" does end up in closer proximity to the bulbs due to her height/pot setup but I check leaf tips for warmth and nothing.
-started using "Ray's Regimen" about a month ago: KLyte, KelpMax, etc. using the 100ppm N weekly Tx.

I'm getting a lot of "Love is a battlefield vibes" with my orchid hobby and could use some advice from others in this "battle" lol
First photos are of "Sunset" in her 6 inchx 5inch pot and cache pot

Last photos are Orange Cluster in 3x3 inch pot