Harry
I am having trouble with your turns. I am guessing that when you state a 270 degree turn you are actually just heading up from a broad reach to a beat. This would be 90 degrees. A boat enters on port and leaves on port. And the 360 degree turn you refer to is actually 180. A boat entering on starboard and leaving on port. 360 would put you back on the heading you started at.
A 270 degree turn would be entering the mark zone on starboard, gybing over to port and then tacking onto starboard, all while circling the mark.
Are there catsailors with the nads to sail on starboard back into the fleet of down-winding port-tacking spin-boats?
Something about right, dead-right?