My reading is that any hit, even a grazing hit, delivers the toxin. I would also say that if the Soak roll reduces the damage to zero, the poison didn't make it into your system.
Which begs the question, what kind of grazing hit actually inflicts damage? As far as I know, touch-only attacks are the only attacks that can inflict damage on a grazing hit, in most (every?) other cases a grazing hit means no damage from the weapon attack.
My reading is that any hit, even a grazing hit, delivers the toxin. I would also say that if the Soak roll reduces the damage to zero, the poison didn't make it into your system.
I would handle the soak roll as the initial Toxin Resistance test. Otherwise, spot on.
Oh? As far as I can tell, a character hit by a weapon coated with toxins should by all rights get both a damage resistance test and a toxin resistance test. Remember, the toxin resistance test is not made until the end of the appropriate combat turn as per the speed of the toxin, and when you roll to resist damage you get to include armor, which is not applicable to resist toxins. To my mind, the two have to be separate tests for all intents and purposes because they use slightly different mechanics (AV and Rating of protective gear, with different results for most toxins based on remaining power vs specific attributes for example).