well the OP's build is centered around choking gas/practiced stance, which is significantly different from a punishing shot build...
but i would have to agree, if you use choking gas you almost need either tigers fury or frenzy, or just some way of making your arrows shoot faster. in this case flurry might actually be not bad considering you never really intended to do damage, but i think frenzy is good enough.
im guessing with things like troll unguent and throw dirt this is meant for TA/CA, but in either case i think whirling defense can replace one of those (or both), and as long as you can keep practiced up when you use choking gas it shouldnt be that bad of an overlap.
i would usually go with 14 expertise in a ranger build like this, and definetly consider using two superior runes and the +30 hp mod on the bow for 410 hp, but im too lazy to actually work out what the stats should be at
