We did it last year. 7 days direct from Lizard Island. in may or june it was. (never do it in cyclone season).
We went straight up the shipping
channel and lay a rhumb line over the gulf a tad above Cape Wessel.
It was a good run.
Lots of folks tried to tell us it would be some death trip and that you need to sail south 100nms into the gulf and then cross. That would have been sheer madness unless on a sight seeing holiday.
As for problems with reef and charts
etc and sailing them at night look at Slocombes adive in 1895. He thought it was safe to sail at night
Have fun, its a great trip