Hi C. ~
I have six kids, 4 boys and 2 girls (ages 3 to 14), and they are all homeschooled. When my boys were little, I delved into tons of research on learning styles, how boys learn, multiple intelligences and other emerging data and coming out of Harvard and elsewhere, facing the same questions and wanting to honor their unique wiring. I'd encourage you to read Armstrong's, "In Their Own Way," as well as anything by John Holt, including "How Children Learn" and "How Children Fail" and "Learning All the Time."
I am also affiliated with the Learning Success Institute in California,http://www.learningsuccessinstitute.com/cmd.php?af=781933 and would encourage you to check out their site and resources, including the "Self Portrait" learning style profile tool http://www.aselfportraitonline.net/store/default.asp?prom..., which incorporates Talents, Interests, Modalities, Environment and Disposition (though geared for 8yrs +). For a very reasonable fee, they also offer a "hybrid" education solution, where you in effect register your son with their "private school," but teach from your home. The founders are experienced educators (read their bios) and help you with building a customized, creative curriculum to match your child's unique learning style, while meeting state requirements.
Also, check out also the encouraging movement spearheaded by Jenifer Fox, www.strengthsmovement.com and her recently released breakthrough book, "Your Child's Strengths."
I'm sure these will help as you seek to bring out the best in your son. Thankfully, schools are catching on too, which you'll see in the Strengths movement. Fuel the progress - forward the links to others!
best ~
S.