I'm having trouble keeping my spinnaker pole pre-bent on the Nacra 6.0 NA. I have about 8 inches of spectra leads running through each bow up to the stock bridle wire that meets the end of the pole.

I have a stopper knot outside each hull followed by a washer, then a bowline that connects to the end of the bridle wire.

The knots seem to be slipping somehow because the pole looses tension after each sail even with pretty significant pre-bend.

What's the best solution for this? What are other people doing?