I've never done it. However my instinct would say that when crossing the gulf stream its better to have more boat then too little. The gulf stream is considered to be one of the black holes that is to be respected.
From my reading it appears that Hunters are lightly stayed and that could be a problem out in the deep blue should a bit of a blow come up.
So my opinion is that the window to cross the gulf in a Hunter safely is pretty narrow and precise. I'd prefer an broader window that is given by a more sturdy boat, and one that could handle any wild cards that mother nature is prone to throw every so often without warning.
In one of those threads I listed there is a person who says he he travels in his Hunter to the Bahamas and has no issues
The other black holes I can remember are.
These places include the Agulhas current in the Mozambique Channel,
The Agulhas Plateau,
The Gulf Stream,
The no mans land between New Zealand and the South Pacific,
The Tasman Sea.
I got the black hole thing from this site.
Welcome to Maxing Out
anyway good luck.