at least that way you're always looking to improve upon something you dont become complacent about your physique and in 18 months time think 'omg where did that flab come from?'
81mg of Aspirin is enough to thin the blood without the effects on the stomach that a 200mg or 325mg tablet has.
I've never heard one report about aspirin causing jitters.
Caffeine is whats responsible for tremors/jitters.
Ephedrine might cause jitters in very high doses, but it should steady the hand in low doses.