If you feel healthier and more energetic than you have over the last 10 years, why do you feel you need the extra fiber? Fiber has two functions in the body:
1) Help clear excess cholesterol from the bloodstream (soluble fiber)
2) Help keep things moving in your intestines (insoluble fiber)
If you don't have cholesterol issues, you're keeping regular, and you feel great, I wouldn't worry about what the RDA for fiber is. One problem with RDA is that it assumes a standardized "American diet" and a similar body chemistry for everyone. If you find a diet-lifestyle combination that works for you, don't feel pressure to change it.