I need to know if the following exotic weapon I have created is overpowered:
Serrated Rapier: One-Handed: 1d4 piercing, 18-20/x2 crit; May apply Weapon Finesse to this weapon, +2 to Bluff checks made to Feint, +2 to confirm critical hits against flat-footed opponents, your crit range against flat-footed opponents is increased by 1 after any modifiers (vs flat-footed targets, a mundane Serrated Rapier's crit range would become 17-20/x2, a Keen Serrated Rapier would have a crit range of 14-20/x2). You may not use a Serrated Rapier in two hands to apply 1-1/2 times strength bonus to damage.
If the crit range boost is a bit much, I much just further boost the crit confirmation.