Hi, Ryan, wrinkles both on leaves (the pleated or accordian leaves) and pbs.
Basically all of my oncidium types develop wrinkles of varying degree on the older pbs once they are brought home. I guess it's the lower humidity in my place.
The leaves only get wrinkles while they are growing as new and do not get enough water. since pbs form after all the leaves are formed, I do not have any wrinkles on new pbs usually. at least white the pbs are forming, they look nice and fat, then some time down the road, they end up getting wrinkles anyway.
I have two that gets wrinkles on the pbs but perk up when I soak them in a water bucket for half an hour. It is so fun to watch!
You mentioned s/h. I thought about trying s/h for oncidiums or mainly just for miltoniopsis because they all love water. but the more I read into it, the less I am interested in trying s/h.
How you have to rinse it so often and if the top layer gets too dry, the potential salts buildup can be a problem to roots and bla bla bla....sounds like a big headache for me.
I thought s/h was something I can get lazy with and water less as long as there's some water sitting at the bottom of a container or a pot.