Phill,
I used the dyneeema on my T. We used the thimble at the top with the dyneema inserted inside the core about 150mm & then stitched with the sewing maching so avoid any slip. Same method at the bottom & never had a problem.
In fact i was so happy we were evenually replacing many lines on the boat with the same simple system.
Ie// spinnaker bridle for the pole, primary line for the self tacker, spinnaker strop at the top of the mast, mainsail down haul strops, primary tack line for the kite.
I started going a little crazy.??
Good Luck
Marcus