Personally I'd stick with Thames, the difference doesn't seem that noticeable to me. Given that most skills like shooting rush and bulletstorm aren't effected by speed enhancement, and the fact that it's not that groundbreaking for frenzy, I don't see the need to sacrifice upwards of 20 max damage for it. That's just my opinion though, mostly because I this Thames > Chinese for a hybrid.
Using automatic could give some much needed balance though, so you might just want to use it.
Put Viscount on thames boots!