Weight of pull, or overtravel have nothing to do with "crispness". "Crisp" means how clean the trigger breaks - preferably with no, or very minimal, creep. The old timers used to speak of a trigger "breaking like a glass rod" or "breaking like an icicle". When the sear breaks, it should break "clean" with minimal movement, until release. The pressure should build - then let go instantaneously.
Mark