I've duckied Westwater several times at apx. 3000,4700,6800,9000,11,000,13,000 . Those 'tweener levels 6800/9000 seemed hardest to me,a lot more squirrelly laterals that don't mess with rafts or skilled kayakers as much. Skull is pretty easy in a ducky . Look out for Sock It To Me . We had a guy swim quite a ways [ 1st big drop Funnel?Big Hummer? to Skull scout eddy, then a foot entrapment
] with major yard sale at 9000 ,dress warm and secure gear well.