ive missed my knife throw because of aim assist, but ive never seen one curve. its like just after i press rb my screen, the characters hand adjust slightly and the blade flies behind them as they strafe the other way. if you can lead your throw just out of aim assist range on a strafing target you can usually land the knife, but being at someones side, them coming to or from you, or standing still make the best targets. Knives have never OHK, and incendiary blade does less precision damage. at the end of the damage incendiary and juggler do the same amount of damage, or ive not correctly noticed the damage.