Pea eggs are so totally different. The shells on chickens gets thin and brittle at hatch time, pea eggs don't. Peas need to loose 10 to 15% weight before hatching. Running too high of humidity the chick will be big and fill the air cell, this will keep the chick from having enough room in the shell to be able to swing the head to break out. If the egg has not lost enough moisture there can be liquid in the shell and the chick can drown. Too dry in the hatcher the chick will dry out too soon and get stuck and if too wet the chick is 'sticky' and can get stuck. The main reason I like my Brinsea as it has a humidity pump and will keep the incubator at a very precise percentage.
There is a lot of balance you have to find and your location may be very different than mine so you will just have to experiment and find what works best for you.
That's why I am asking what people use to hatch their chickens at so I can see the difference. If you hatch your chickens at 50 as well as your peafowl, then I'd start with what I hatch my chickens at. But if you incubated your chickens at 40 and your peafowl at 50, then I'd probably start with a ten percent difference than I normally use.