As far as bridles go-
I rigged it different on my 6.0 but now that I have a boat that has a spin pole that is like the poles on the f16 (where you wrap the bridle around the pole then tie it) I need to come up with something different. Why not have a well tied loop around the tip of the spin pole then have the bridle lines made of spectra with eye splices at the precise length they would be with the pole properly tensioned? you could use small shackles to attach then to the loop on the spin pole. You could even just use one shackle to attach both bridle lines to the loop. It can be difficult getting the length right but this would elimate the knot issue, have non stretch bridle lines, and actually make set up a little easier. If you haven't learned how to eye splice spectra yet... it is so damn easy you will wonder why you haven't done it before and you will find yourself doing it everywhere else possible.
I could be way off of course, but thought I would throw that out there.