I would just fill the rest out with acc (19, becomes 28 on top of weapon's base 9). Our group's SCH did his Novus pretty much exactly like that. It's not entirely about how much you "need" or would make it worthwhile especially when you're already up to 3rd tier capped on crit/det and concerned mildly about cost. Lets you free up another 1-2 slots (depending) on acc builds for i110 piece instead of i90.