fastest is still chick hat + katar with endow.
(similar to renewal lvling, since kafra shop is up)
and GT when there's a sufficient mob.
cards will take a while for circulation for perfectly carded daggers.
ice pick is a long haul option and will not be in for a while (3rd god item seal quest)
crit with abrasives would be somewhat viable depending on your target (possibly anolians?)
chick hat + katar still > all atm, other than leeching (rip LoD).
as far as poison skills go, its preference. Venom Splasher does do damage, and you can reference the wiki for the poisoned target dmg calc (might be there not certain). Venom Dust forces the poison status, minor hp drain and minor vit reduction on target. Enchant Poison will enable some +25% dmg on some specific targets (look up monster database), if you dont have access to endow sage.
generally, though, if you're planning to 99, you will be ctrl clicking all the way, unless you like suicidal GT mobbing.