Here is what I've tried so far to try and keep Preston from getting mad: I also tried having Preston as my companion during this mission, hoping that I could maybe convince him to trust me even if he hated me and eventually rebuild our relationship, and still got a laser in my face for my troubles. I planted the flag and went directly to The Castle only to get a laser in my face for my troubles. Preston is currently my lover so it's not a question of getting his affinity higher. Preston and Ronnie however immediately go hostile without giving me a chance to explain myself. The settlement I picked doesn't involve forcing any settlers off their land I'm literally just creating one settlement that I plan to completely neglect until I can get the power on at Nuka World and slaughter everyone (including the settlement in the Commonwealth). I'd like to get the perks from completing Power Play but as soon as I set a raider flag in the Commonwealth, I'm informed that 'Preston hated that' (understandably so, even if he has no way of knowing because this settlement is miles away). I'm playing the sort of character who wouldn't side with the Raiders but would play along with them long enough to get everything I could before murdering them all. TL DR I want to get the perks for completing Nuka World but don't want Preston to shoot me in the face.