That is kind of a funky bevel...I once had a (new) TI that looked like that; never could quite warm up to that blade. My advice to anyone starting off with a straight is to get a new one, professionally honed, made by a quality manufacturer. "Vintage"=OLD.
Kind of like your automobile. Most people (like me nearly 50 years ago) do not have the wherewithall to buy a nice, shiny, brand new car right from the get go (mine was a $300 Ford Fairlane) and with anything like that comes the possibility/probability of some sort if issues.

Buy the Boker..those old, vintage blades will be around once you figure things out.