Ok, thanks to all the advice. I changed my halyward to 4mm dyneema and now the sail hooks an unhooks like a charm. We're sending feedback to the factory to let them know that 6mm on the main halyard is too thick.

Now on to the spacer on the spinnaker, yes, i'm curious too as to how the lines should run.

Anyway, was out sailing today in 6-10 knots of breeze and the boats sailed like a charm. Am actually surprised how fast the viper gets powered up and flies a hull. I have a strong feeling the volume in the hulls help it to fly earlier.

Dropped the rake a bit further back and the boat now tracks better.