Allways shallow. That what shavettes have teached me. Next shave tomorrow will be my first (and last ?) steep angele shave.I remember how you wrote that you feel the blade. Now shave steep and see. Do you always shave shallow? I only do for razors that prefer it, like the Blackbird or the mentioned Chiseled Face Legacy razor.
My understanding is that guard is to help you out from the very bad situation when you shave angle is wrong/too steep.