It helps to live within 50 miles of the National Soaring Museum, the Glenn Curtiss Museum, and the International Motorsport Library at Watkins Glen, NY...
As for the long tail vs Kamm back, the surface drag of a long tail is more than offset by the reduction in drag induced by turbulence and separation. There are lots of good books and articles available that explain this in detail. I use my old college text on fluid mechanics and Dr. Joseph Katz's book "Race Car Aerodynamics: Designing for Speed".
The interactions with side wind and the lean angle of a faired recumbent will take a good bit of thought and testing to optimize. Some air will go under and some will spill over the top. Reduce side drag and try to minimize lift, again rounder on the bottom and flatter on top. My boys want a home made wind tunnel for a science project and I have some models to test. My fairings on an upright bike come only to the knee and are round cones at present. Cross winds have had little effect.