Regarding crit sins

So I have read that crit doesnt fully pierce armors and I am currently building towards an equip crit assassin. Knowing this, I have the following options:

1. Pursue crit by aiming for triple crit Jur and kobold cards.(Current path)
2. Go for Racials or elements katar[2] plus Snake Hat for double attack? With this I'll be aiming 40-50 dex with angel spirit.
3. Go for triple assaulter jur (crit damage plus crit rate on demi human).

I don't plan on going for DD. Maybe someday if icepick is viable.