My Timneh has perches available varying from 1/2 inch to 2 inches. He sleeps on a concrete perch that is about 1.5 inches in diameter. That is his choice. However, when I got him someone here on the forum told me they tend to sleep on the highest perch available. So, I put the concrete one up there to help with nail grooming and sure enough, that is the one he sleeps on.
I was just thinking that I hadn't posted a pic of Timber in a long time... One of his favorite things is to sit on my arm and veg while I am on the laptop. I don't take good pictures, but his left foot (closest to my elbow) was up until the flash and he is grinding his beak.
Timber is partial to pine nuts. Grey's are individuals that way, what one likes another may not. Nutriberries are a good treat (in my opinion) but for training I would think you would need something small. I know some use sunflower seeds.
LOL I'm just not that accommodating. I cook it the way I want it, they eat it if they choose to do so. That's the way I was raised, that's the way it will be at my house. Some how, they all manage to show up anyway! Not saying the wine isn't a good idea though