Mark
Have a look at the TT Moment.
I know that most think that a double wall will have less condensation than a single but as you found out , it isn't necessarily so. In most cases you simply don't see the condensation till it starts dripping on you or you find that your sb is a lot heavier than the night before...
There is a brand new review of a British double wall tent at BPL where the author states that he has had the worst condensation ever inside it.
This guy, Ray Estrella, is a VERY prolific tent tester, but this shelter (Terra Nova Laser) also has a similar ground hagging fly with no top vents.
The key element to fight condensation is ventilation, air flow. I don't see much of that happening with the Spitfire.
Look at the Moment page at the TT site, and you will note two large end vents (that can be closed) rain protected 360 degree mesh and two top vents(that can also be close)
The Moment is not freestanding but goes up quickly (see my set up video) with just two pegs. If you camp in exposed areas, then install the pole guylines, making that 4 pegs when you need them.
Note that the vestibule is supported, so no pegs needed for that.
So again it needs less pegging than most "freestanding" tents.

http://www.youtube.com/watch?v=CWZQKivY2SA

http://www.tarptent.com/moment.html

Franco