not sure but I would never 6 hit with a GS, your just losing to much dmg from not doing as many ws's.
With normal torc based spam sets, you need 61 stp while /sam. Really isnt as much as people make it out to be, and you can still rock high 40's for DA. The set below hold 43% DA for example and 61 stp for me, there is room for better stp augs, and better DA, ideally it could be 61stp AND have 47% DA. While yes you can get some more multi hit dropping to a 6 hit, I just see it as trying to make a step forward by 2 back.
ItemSet 347333
Plus in this set with its high DA rate, and needing just 4 hits during tp phase, means a lot of the time you will just need 2 rounds between ws, its very easy to gauge. Which for a ws like torc that does scale with tp well, but benefit much more by 1k spam then holding, id say its hard to justify a different build. I have tried a QA14 build for example and was not impressed.