CC19 Rigging for Idjets - Q3 - Gaff Questions

Third in a series, begging your indulgence.
1. The manual says that the gaff span should be tied "as tightly as possible" to the gaff spar. Mine is well-tied and snug, but if you pull up on the running block, it gets to 14-16" up above the spar. Is this too much, and should it be untied and then tied with less slack in it?
2. What is best practice for lacing the top of the main (is that called the "head" of the main on a gaff mainsail?) to the gaff spar?
3. I don't get from the manual pictures how the throat halyard attaches to the gaff jaw? The manual seems to say that you just tie or lash it onto the through-bolt. That seems like an unnecessary nuisance - are there any hardware arrangements that help with that process? If not, what kind of knot(s) do you use to a) be secure, b) not allow the jaw to twist while raising, or for that matter after being raised.
Thanks for your guidance.
S.
1. The manual says that the gaff span should be tied "as tightly as possible" to the gaff spar. Mine is well-tied and snug, but if you pull up on the running block, it gets to 14-16" up above the spar. Is this too much, and should it be untied and then tied with less slack in it?
2. What is best practice for lacing the top of the main (is that called the "head" of the main on a gaff mainsail?) to the gaff spar?
3. I don't get from the manual pictures how the throat halyard attaches to the gaff jaw? The manual seems to say that you just tie or lash it onto the through-bolt. That seems like an unnecessary nuisance - are there any hardware arrangements that help with that process? If not, what kind of knot(s) do you use to a) be secure, b) not allow the jaw to twist while raising, or for that matter after being raised.
Thanks for your guidance.
S.