I'm not a huge fan of spads, but they can fly OK. They end up heavier than a traditional balsa plane, but sometimes their toughness is an OK tradeoff over performance. Over at the SPAD forum there is a fairly new thread about a .15 sized flying wing that you could size up a little.
I'll bet this plane would give you what you're looking for, with a working rudder it should be a hoot.