4-4-2 Hex has always worked well for me, as It's extremely flexible, and I usually swap an ST for DMC, turning into a 4-5-1V when more defensive tactics are needed.
You'll need good wingers to pull this formation off though.
I don't claim to be a Top Eleven expert but, if anyone would like advice, please don't hesitate to contact me through 'private messaging', I try to reply as soon as possible.