Vicecannon is only really usable on a nightblade. Morag tong should only apply to abilities and not sets from my understanding. With that being said I have used vicecannon and sheer venom on my stamblade for roughly the last nine months and loved it. With the recent transmutation addition I now have pretty insane burst damage as well as all the dot damamge.
I've been running sheer venom since it's release on my nightblade. I work all my builds around it starting with that set but I'm also a bowblade and main my dps on bow bar.