Sawtooth gets ALL THE DAMAGE U WOULD DO summed it, and do it as piercing damage, and also sets bleeding, for only 2 ap, its easy to hit for tons of damage if u have both weapons coated with poison, having runes and then using venom coating skill.
I personally find sawtooth pretty average. I find it better to strip off the armor of an enemy to be able to CC him. And if you did not kill him with swatooth, you will have to destroy his armor anyways so...
Concerning your poison coating, I think it is useless since it will lightly hit the magical armor when I am doing physical damages. I always coat my weapons with poison because I like to feel optimized but it is 99,9% useless in DOS2.
By the way, it is rare for someone to not mention Adrenaline ^^
Do you not like the skill ?
Concerning wind-up toy, I prefer using my AP with skills more effective. And there a lot of skill way better than that. If I want to AoE, I do Battlestomp or whildwind (that can even backstab :p).