I just paid 5K (and will pay a second 5K for repainting and new gutters) for my new IKO Cambridge roof, and I was hoping to get some peace of mind of whether I should have any concerns. In particular, should I be concerned about… the cuts in the ridge all the way to the wall where there appears to be no barrier except a layer of shingles (the final 2 photos)? how easily the ridge shingles peel up? the unpeeled backing? the old flashing? I can see two different underlayments from the attic, mostly black, but the lower section on one side is white instead. Please see the album below, questions are captioned below some of the photos. I appreciate all your input very much. Thank you!