Re: peanut butter, there's no hard and fast rule as to how much is too much as it depends on the rest of the bird's diet, their health, the type of peanut butter, etc. But you are right to limit it. These guys are tiny compared to us, so portion sizes need to be adjusted accordingly. You want them to be getting the majority of their nutrition from pellets, vegetables, berries, etc.
We use it sparingly in our house, and usually as rewards for behavior. The less junk in the peanut butter, the better. There are brands whose only ingredient is "peanuts" and you can also make your own nut butters by blending up actual nuts. (Being careful about our birds' health has also made us make healthier choices for ourselves!)
As for honey, I couldn't find anything suggesting it should be avoided while doing a search right now. I do remember reading something years ago recommending not feeding it to parrots for the same reason infants under age 1 shouldn't be fed honey (not sure who the source was on that, so not sure if that's true especially as I couldn't find any corroborating evidence now.)
In my house, we play it safe and do not offer honey to the birds. There are so many things you can offer as treats that have nutritional benefits as well. Sorry I couldn't give a better answer on that -- hopefully someone else will come along who knows for sure!
ETA: Nancy came through again with the honey link