Join Date: Dec 2013
Location: New Jersey, USA
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Clive is correct, you need a complete check-up. There was a feather picker on another forum and it was found (through XRays) that his gonads were huge (sexual frustration) and going by the schedule you mentioned he had in the past (added to a bad diet, I am sure), it would not be surprising is this was the cause or adding to it.
Aside from that, a good fresh food diet (I would not feed him pellets) with a little seed for dinner, a good quality full spectrum light (CRI higher than 93 and Ktemp between 5000 and 5500), a source of UVA and UVB, a strict solar schedule and enrichment (hours of out of cage time, flying, toys, foraging opportunities, etc) will do him wonders but, as Clive said, sometimes, even when we make everything that was wrong right, the habit has become so ingrained that it can't be broken. BUT, in my personal experience, it's always greatly diminished so, instead of chronic plucking and barbering (he is doing both), he might end plucking just one small spot or doing it only seasonally.