maybe try loading your sail up with more power than normal and do a wider turn than normal....and try and remember these 3 things...
bend ze knees (keeps u stable)
weight slightly forward, (no sinky stalling tail)
flip it early as poss, (no speed loss / stall)
it's better to really GO FOR IT and fall in, rather than puss around doing half arsed gybes for months on end coz u r scared of jellyfish!!.....like i did