I would not add asprin for the simple fact that the more you use it, the less effective it will be for pain reduction if you need it. This in addition to what 0311 posted.

How long have you been taking the e/c stack? and are you a regular caffiene user? 300mg seems very high to me, you could be used to it already.

You also need to remember that e/c should be cycled. Your beta2 receptors will downregulate after 2 or 3 weeks. I would cycle two wks on two wks off.

oh and just as an aside, just cause you dont "feel" it, doesnt mean its not working.

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