How do you farm well with leblanc?

last hitting minions is easier for me than trying to last hit them under tower. using her sigil of malice is a late game thing and the minions are always surviving with a little bit of hp. Under tower I have to aa a melee minion once wait for two tower shots, then aa again to kill that minion. Castor minions is after one tower shot. However the problem I'm having is her slow attack speed and sigil of malice not killin the minion fully.
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