I was describing singlehanding with spi on my F16 in commonly encountered conditions at my club.
I rarely trapeze under spinnaker when singlehanding. The seastate can be quite rough overhere and I don't have toe straps on my boat. It is very difficult to stay with the boat then. Also I found that my spinnaker likes to go deep better then high and fast. So I sit in to quickly lift the luff hull and then steer as deep as possible without dipping the luff hull in. I do however hike outward under spi often. Feet under the feet straps off the trampoline, butt overboard and then hanging flat on my abdominal muscles.
This works very well for me. I'm fast under spi when singlehanding and make up heaps of ground there.
WOuter