Oncidium repot question

[BD11]

Hi I am pretty new at growing orchids so I was wondering if repotting oncidium orchids always causes them to go into shock.

I have two that I have repotted and on both of them the bulbs have gotten really wrinkled even though they had good roots.

One of them had hardly any dead roots and the other had quite a bit that I had to cut off. Both of them seem to be doing the same as far as no matter how much I water the pseudobulbs don't seem to want to plump back up again.

I took them both out of the moss they came in and put them in a bark and moss mix so the roots would get more air.

I am wondering if I am possibly doing something wrong. Maybe I was too rough removing the old medium because I did spend a lot of time on one of them getting all the old moss out of the roots.

Thanks