i guess i didnt need to test crit strike for lb...
they updated crit strike on their page:
Skills that convert Physical damage to a different type (Magic, Fire and Cold Arrows, Lightning Bolt, Fists of Fire, Berserk, Concentrate, and Frenzy (when synergized by Berserk)) do so after DS or CS are applied, so converted damage is doubled.
Heres the link for your reference in guide
http://classic.battle.net/diablo2exp/items/magic.shtml