Perfectspecimen, have you tried stacking the oral yohimbine with ephedrine? Ephedrine acts both as a so called "non-specific adrenergic agonist" and by causing your nerve cells to release norepinephrine. The nerve cells however also have alpha 2 receptors that bind norepinephrine and ephedrine. When this binding happens, the nerve cells quit releasing norepinephrine. This is a classic negative feedback loop.
What yohimbine does is block the alpha 2 receptors, shutting down the negative feedback cycle, so your nerve endings continue to release norepinephrine, keeping your metabolism high.
This combination, IMO, is far better than either product taken alone.