Just one comment about long knots on Spinnakers.. I assume this is in reference to an A sail. While few symmetrical spins are tied on, if they are then long knots are problematic when acting as a guy vis-a-vis the pole. The tack/clew should be as close to the pole as possible for stability.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"