Speaking to address the large amount of line in the pole spin system, you are correct that if you loosely coil it up and slide it under a hiking strap, the spin bag, or some other area is best.

When you're ready to douse the spin, toss the coil of line behind the boat (in the water). This helps get any minor kinks out of the line, ensuring a smooth take-down.

Snuffer is best on bouys, pole is good for distance. The one line system on the pole is easiest, but doesn't allow you to adjust luff tension on the spin (if you need to do so, for instance, to pinch higher or in heavy air)using the tack line. I've never had to adjust luff tension that much, but I know some of the rock stars use that to their advantage on a few occasions...