Welcome... LOVE your research orientation. Here's my quick 2 cents. Of course, all birds are different, but...
Just in case you want to increase pellets...
I love Harrison's, supplemented by fresh healthy treats. My first and current avian vet recommended it. My bird loves the pellets now, but to get him converted, my avian vet suggested putting pellets out all day, and putting seeds (his old diet) out for two 15-minute periods a day. That would sustain him but leave him hungry. He was eating pellets in a couple of days, and now I can feed a good variety of other stuff, knowing he has the pellets as a basic.
Just in case you want to increase pellets...
I love Harrison's, supplemented by fresh healthy treats. My first and current avian vet recommended it. My bird loves the pellets now, but to get him converted, my avian vet suggested putting pellets out all day, and putting seeds (his old diet) out for two 15-minute periods a day. That would sustain him but leave him hungry. He was eating pellets in a couple of days, and now I can feed a good variety of other stuff, knowing he has the pellets as a basic.