I'd add narrow sheeting angles coupled with underbody configurations that won't stall when you try to sail that high...
Not too sure that large overlapping genoas are especially conducive to pointing ability on their own. These headsails came into the fore to make up for the lack of sail area of the skinny high aspect mains of the day.... depends more on sheeting angles. Look at all of today's non-overlapping rigs like the Farr 40 and others you'll see out on the race courses.
Hopefully Jeff H will chime in with the definitive essay on the subject.
".. 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"