1. The pitches go up to f4b according to guidebook, and not grade 3 as stated here. In fact there is at least one more 4a pitch.
2. Not sure why one would carry double ropes (I read many reports elsewhere that suggested so); the route is bolted and hardly anyone (in rock shoes) will find climbing challenging; so I would prefer to carry a single 40 m rope for a fast and safe trip.