I have two crimson-belly conures, a bonded brother and sister pair about 10 months old. I'd only had experience with budgies when I got them about six months ago and I realise now that I'm hopelessly out of my depth with these two and desperate for advice. They are handreared birds, not at all affectionate or cuddly (though weirdly possessive?) but happy to step up and have learned to come to my hand when called, but they are otherwise totally impervious to all my efforts to train them.
I've had a lot of issues with them since I got them (biting and screaming especially) but chief is that I cannot train them to redirect their chewing to safe areas. They will chew everything, doors, furniture, electrical cables, you name it. Obviously it's an important natural behaviour for them, but for example I have tried picking one single area they are not allowed to chew (the doorframe) and have abysmally failed at even training them to leave that alone. They have 3 hours out of cage time every evening, and for the past 4 weeks we have focused on training them as consistently as possibly to leave that one area alone. I first tried redirecting them every time with a firm no and transferring them onto their hanging playgym, and rewarding them when they chewed or played on their own toys (they have multiple play areas around the room). That had no effect whatsoever, so I then tried telling them off and putting them back in their cage every time they chewed on the doorframe. We go through this process 3-4 times every evening. They clearly know they are not allowed on the doorframe, and dislike going back in their cage for timeout, but just will not stop. They have several places they love to chew, so it isn't something particularly special about the doorframe they just can't resist. The level of destruction is just not sustainable longterm, aside from potential eating paint and varnish issues.
What am I doing wrong? What training methods would you use? I am pretty desperate for just one win with these birds at this point, I have to admit.