Usually Blitzers on Elven teams en up as support staff with guard, since all Elven teams with Blitzers have equally strong and equally fast (or faster) players with lower AV (7) that need to be screened, and thus are better suited for the hit and run role of a killer.
That said, on the actual Elf team, Catchers can also be skilled straight into ballhawks, meaning that a Blitzer could take a killer role, especially if Piling On is involved, since their AV8 make them somewhat more durable during the retribution fouls.
And back in the days one CC team did have a famously annoying POMB-tackling blitzer.
As for your build suggestions, you might have dodge too early. Also juggernaut is an option to piling on, since it allows hunting of wrestlers, reduces the risk of getting caught next to an opposing player after a poor blitz, and finally it helps when trying to pull a oneturner or fast score against a crew including standfirmers.