Azure does need tweaking but I never really got around to it. There are some areas of the map that you can get stuck on and I've even fallen through once or twice.
As to the textures I just work with what I have. No one else has complained or given me feedback saying similar.
I'll pop on IRC later and see if I can coax someone into giving me that ratio.
EDIT: Done. Smelter has been scaled to 1.3.