If you change anything in the assessment, use a black marker and cross the old finding out or otherwise obscure it so you can't see it. Other nurses have no right to make you feel badly for your methods. Sounds to me like you are resourceful and have found a way that saves time that you can spend on more important things. When a nurse told me recently that she would have done something differently, I smiled sweetly and said "well, now you have your chance. It's your shift now."