getting into those tight sections with the tig torch can be tough, a mini torch with a flexible head will be easier to maneuver in those tight places. I would suggest going to your welding supply store and talking to them about a gas lens, that will provide you with better gas coverage for those complicated joints.
Understanding the Basics of Gas Lenses some pretty good information about lenses here.
a good torch setup goes a long way. you can also get some smaller diameter tungsten, i would also suggest grinding more of a gradual taper on the tip of your tungsten, it will help the gas flow surrounding the weld pool, and let you turn up the flow rate a bit.
hope that helps a bit