You might want to shoot an email to Jaime at Overo Corgis in Buda, TX. She is a reputable breeder and runs the annual regional Corgi picnics and participates in rescue.
Welcome to Overo Pembroke Welsh Corgis, Buda, Texas
All the reputable breeders can end up with some fluffies despite all the time and effort they put into "building a better Corgi".
Jaime took a couple of months to answer my email last Fall when I was looking for a Corgi, but she did eventually respond, so don't give up on her...she's apparently just very busy. She may be able to help you find a fluffy since she's "in the Corgi loop" and offer you advice on breeding Corgis.