There's a bit of mystery on this....
Originally, a dev told ToR that the Fencing & 6-part bonus values were reversed on the chart for the Knowledge base. So they reversed the numbers, and show that the 6-parters get the POF chance.
Other people have sworn that the numbers aren't switched.
Strangely, in the month Great Pumpkinator released the first version of his BOD calculator, he got POF from his fencing, and gloves from a 6-parter, when I got POF from a 6-parter, and had long before given up filling the Fencing ones because of getting gloves.
I've been trying to fill both, ever since then, to see which is right, but out of 4 fencing & 10 6-parters so far, I've only gotten PTs & GPA, which can occur from EITHER result.
So, there's multiple possibilities.
1. the charts are both wrong, and that there is a chance of getting powder from both.
2. ToR is right
3. the KB is right (and hence, the stratics calculators are as well)
4. ToR was right for 3 years, then some dev noticed the code was different from the KB, and "fixed" the code to match the KB.
5. (and, somehow I feel this is more likely, no matter how improbable it may be) Something is wrong with the code and either result may occur, OR it may differ from shard to shard.
I just wish we knew which dev it was that told ToR their info...