There's plenty of solo aid at the lower wall. The trick on some is rigging anchors. So far I've soloed (from left to right):
Snow White (p1)
Numbah Ten (p1)
Iron Horse (p1)
Japanese Gardens (p1)
City Park (p1 & p2 link w/ 60m ropes)
Narrow Arrow Overhang (p1 & p2 link w/ 60m ropes)
Narrow Arrow Direct (p1 & p2 link w/ 60m ropes)
They all went clean except Snow White, which I placed a couple kb's for protection on the thin crack below the first little roof.
(You don't need the anchor bolts on City Park, just lasso the freakin' boulder).