yup, dont lighten.
your pick up is less with the knife edge.
and whip is impossible with a stock crank as its not the full assembly(clutch flywheel) balance that stops whip its the single element, ie the crank needs balanced bang on (like stock)
if you know what you want and can explain it to you engineer and there is some benefit that you need it done for, then fire away.
but i would be MASSIVELY surprised if even the 9sec malta drag 4e runs anything lightened in the flywheel/crank department.
Phil