he's an amazon and they are all nuts.
what kind of perches did you have before? have you tried manzanita or ironwood branches? they are industructible and i'll bet he/she ate the last perches. i'm not particularly fond of dowels, birds need different diameter perches so that their feet can move and grip differently all the time.
is he in an outside cage or is it moveable. looks like you made the cage and it looks pretty good.