I think they can all be done as a single rap, depending on whether you want to ride the rope all the way down or try a little free air time :-)

The gully to the right of High E definitely goes with double 60's requiring, if I remember, a downclimb of less than 10 feet. This may not always be the best option because the gully is low angle and the ropes.... Went simul down that in a thunderstorm each managing a rope; got both parties off real quick!

You can definitely do High E in one rap with two 60s except I'll throw in a warning to watch the end of the rope because I did once have a supposed 60 that came up 15 feet short. Most of them make it though.

I'll second this, you can rap High E with two "genuine" 60's but remember that ropes shrink and you may have to watch carefully at the bottom. That's how we realised that one of our 60m ropes had woefully shrunk!

maybe you can but why would you bother?

I've heard of this shrinkage but have (ahem) no personal experience with said problem. Stop sniggering, Browndog.