No. Every priest and every bishop I have seen, cross themselves as they and our parents have taught us, to cross ourselves. I am a chanter and don't mind offering that when I'm concentrating on chanting, I am not as conscious of my prayerfullness as I cross myself, every few minutes, it seems. I know my stavro is a little sloppier than it should be. At a wedding once, a Roman Catholic guest approached me afterward and asked me why Orthodox cross themselves twice, because that's what he'd seen me do. I acknowledged that I may make the sign of the cross once or three times, but if I did it twice, it was in error. For clergy, their vestments, while holding a book, too, as noted above, may affect the exactness of the form of making the sign of the cross.