Oncidium PBs growing smaller?

[Dante1709]

I've had this Oncidium " Twinkle" for a year now, and it's grown 4 new pseudobulbs in my care. They started out smaller, but nothing that seemed too alarming. I was told that this was because it was adjusting to my environment. The new pseudobulbs are around they size of a Canadian dime and I'm a bit worried.


IMG_1569 by Dante1709, on Flickr

I give it plenty of sunlight (maybe just a bit more than it can take, since the leaves are a bit on the yellower side, but still healthy), decent humidity (40%+), as well as what I believe is enough water and fertilizer. I give them the morning inside and I let them outside in the shade when it's warm, and often, this is a quick temperature change.

I've done a quick google search and I've found things about plants slowly dying when this happens, but I want to find WHY this would be happening, if there's anything I can do to help it..etc