Thanks Timbo!
I suppose it will make more sense afterwards, but I'm trying to understand the ideal situation beforehand, so I don't have to go changing it afterwards. Besides, I like drawing diagrams using Inkscape :-)

If I eliminate the 2:1 tack line, I increase resistance on the halyard at the same time...
I had not thought about having the halyard higher up on the mast to take advantage of "weight assisted" hoisting! Good point there...
I gather you pull out the tack line first when you hoist and last when you douse the spin? (do you have the setup with a separate tack-release line and tack-line or just the tack-line coming in to a cleat on the beam (much like the furler line on a roller furling jib)?

Regards,
Dennis