Good on your for making the switch to SIPs!
I would say no to the peat and aeration. In the past I used bagged soil and OSF. Just use your Coots mix with 1 cup OSF per cu foot. I top dress 3ish times with Crustacean meal, Insect Frass, ground Barley, EWC, Compost, and lastly some Kashi. Once...